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13244440 = 2351131971
BaseRepresentation
bin110010100001…
…100000011000
3220220212221211
4302201200120
511342310230
61151512504
7220401346
oct62414030
926825854
1013244440
117526820
124528734
132989561
141a8a996
15126942a
hexca1818

13244440 has 64 divisors (see below), whose sum is σ = 33592320. Its totient is φ = 4656000.

The previous prime is 13244431. The next prime is 13244443. The reversal of 13244440 is 4444231.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13244443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13155 + ... + 14125.

It is an arithmetic number, because the mean of its divisors is an integer number (524880).

Almost surely, 213244440 is an apocalyptic number.

13244440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13244440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16796160).

13244440 is an abundant number, since it is smaller than the sum of its proper divisors (20347880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13244440 is a wasteful number, since it uses less digits than its factorization.

13244440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024 (or 1020 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 13244440 is about 3639.2911397688. The cubic root of 13244440 is about 236.5980713279.

Adding to 13244440 its reverse (4444231), we get a palindrome (17688671).

The spelling of 13244440 in words is "thirteen million, two hundred forty-four thousand, four hundred forty".

Divisors: 1 2 4 5 8 10 11 20 22 31 40 44 55 62 88 110 124 155 220 248 310 341 440 620 682 971 1240 1364 1705 1942 2728 3410 3884 4855 6820 7768 9710 10681 13640 19420 21362 30101 38840 42724 53405 60202 85448 106810 120404 150505 213620 240808 301010 331111 427240 602020 662222 1204040 1324444 1655555 2648888 3311110 6622220 13244440