13656040 has 32 divisors (see below), whose sum is σ = 30899880. Its totient is φ = 5431552.

The previous prime is 13656031. The next prime is 13656077. The reversal of 13656040 is 4065631.

It can be written as a sum of positive squares in 4 ways, for example, as 13264164 + 391876 = 3642^2 + 626^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13655996 and 13656014.

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, 7014 + ... + 8746.

Almost surely, 2^13656040 is an apocalyptic number.

13656040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13656040 is an abundant number, since it is smaller than the sum of its proper divisors (17243840).

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

13656040 is a wasteful number, since it uses less digits than its factorization.

13656040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1941 (or 1937 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 13656040 is about 3695.4079612405. The cubic root of 13656040 is about 239.0240459458.

The spelling of 13656040 in words is "thirteen million, six hundred fifty-six thousand, forty".