13156440 has 64 divisors (see below), whose sum is σ = 43061760. Its totient is φ = 3189120.

The previous prime is 13156439. The next prime is 13156447. The reversal of 13156440 is 4465131.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 13156440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13156447) 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, 3664 + ... + 6303.

It is an arithmetic number, because the mean of its divisors is an integer number (672840).

Almost surely, 2^13156440 is an apocalyptic number.

13156440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13156440 is an abundant number, since it is smaller than the sum of its proper divisors (29905320).

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

13156440 is a wasteful number, since it uses less digits than its factorization.

13156440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9992 (or 9988 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 13156440 is about 3627.1807233718. The cubic root of 13156440 is about 236.0728971399.

The spelling of 13156440 in words is "thirteen million, one hundred fifty-six thousand, four hundred forty".