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12122440 = 2351127551
BaseRepresentation
bin101110001111…
…100101001000
3211210212212021
4232033211020
511100404230
61111454224
7205016251
oct56174510
924725767
1012122440
11692a850
124087374
132685955
141877b28
1510e6c7a
hexb8f948

12122440 has 32 divisors (see below), whose sum is σ = 29756160. Its totient is φ = 4408000.

The previous prime is 12122419. The next prime is 12122443. The reversal of 12122440 is 4422121.

12122440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13336 + ... + 14215.

It is an arithmetic number, because the mean of its divisors is an integer number (929880).

Almost surely, 212122440 is an apocalyptic number.

12122440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12122440 is an abundant number, since it is smaller than the sum of its proper divisors (17633720).

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

12122440 is a wasteful number, since it uses less digits than its factorization.

12122440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27573 (or 27569 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 12122440 is about 3481.7294553138. The cubic root of 12122440 is about 229.7188751778.

Adding to 12122440 its reverse (4422121), we get a palindrome (16544561).

The spelling of 12122440 in words is "twelve million, one hundred twenty-two thousand, four hundred forty".

Divisors: 1 2 4 5 8 10 11 20 22 40 44 55 88 110 220 440 27551 55102 110204 137755 220408 275510 303061 551020 606122 1102040 1212244 1515305 2424488 3030610 6061220 12122440