13156640 has 96 divisors (see below), whose sum is σ = 37666944. Its totient is φ = 4239360.

The previous prime is 13156639. The next prime is 13156643. The reversal of 13156640 is 4665131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13156643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18695 + ... + 19385.

It is an arithmetic number, because the mean of its divisors is an integer number (392364).

Almost surely, 2^13156640 is an apocalyptic number.

13156640 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 13156640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18833472).

13156640 is an abundant number, since it is smaller than the sum of its proper divisors (24510304).

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

13156640 is a wasteful number, since it uses less digits than its factorization.

13156640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730 (or 722 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 13156640 is about 3627.2082928886. The cubic root of 13156640 is about 236.0740933687.

The spelling of 13156640 in words is "thirteen million, one hundred fifty-six thousand, six hundred forty".