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13240 = 235331
BaseRepresentation
bin11001110111000
3200011101
43032320
5410430
6141144
753413
oct31670
920141
1013240
119a47
1277b4
136046
144b7a
153dca
hex33b8

13240 has 16 divisors (see below), whose sum is σ = 29880. Its totient is φ = 5280.

The previous prime is 13229. The next prime is 13241. The reversal of 13240 is 4231.

13240 = T3 + T4 + ... + T42.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126 + ... + 205.

213240 is an apocalyptic number.

13240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13240 is an abundant number, since it is smaller than the sum of its proper divisors (16640).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14940).

13240 is a wasteful number, since it uses less digits than its factorization.

13240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 13240 is about 115.0651989091. The cubic root of 13240 is about 23.6571629721.

Adding to 13240 its reverse (4231), we get a palindrome (17471).

Subtracting from 13240 its reverse (4231), we obtain a palindrome (9009).

It can be divided in two parts, 13 and 240, that added together give a triangular number (253 = T22).

The spelling of 13240 in words is "thirteen thousand, two hundred forty".

Divisors: 1 2 4 5 8 10 20 40 331 662 1324 1655 2648 3310 6620 13240