13291440 has 40 divisors (see below), whose sum is σ = 41204208. Its totient is φ = 3544320.

The previous prime is 13291427. The next prime is 13291451. The reversal of 13291440 is 4419231.

It is a tau number, because it is divible by the number of its divisors (40).

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 13291440.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27451 + ... + 27930.

Almost surely, 2^13291440 is an apocalyptic number.

13291440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13291440 is an abundant number, since it is smaller than the sum of its proper divisors (27912768).

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

13291440 is a wasteful number, since it uses less digits than its factorization.

13291440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55397 (or 55391 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 13291440 is about 3645.7427226835. The cubic root of 13291440 is about 236.8776095442.

It can be divided in two parts, 13291 and 440, that added together give a palindrome (13731).

The spelling of 13291440 in words is "thirteen million, two hundred ninety-one thousand, four hundred forty".