13920840 has 48 divisors (see below), whose sum is σ = 45243900. Its totient is φ = 3712128.

The previous prime is 13920833. The next prime is 13920859. The reversal of 13920840 is 4802931.

It can be written as a sum of positive squares in 2 ways, for example, as 12916836 + 1004004 = 3594^2 + 1002^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18975 + ... + 19694.

Almost surely, 2^13920840 is an apocalyptic number.

13920840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13920840 is an abundant number, since it is smaller than the sum of its proper divisors (31323060).

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

13920840 is a wasteful number, since it uses less digits than its factorization.

13920840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38686 (or 38679 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 13920840 is about 3731.0641913535. The cubic root of 13920840 is about 240.5591131240.

The spelling of 13920840 in words is "thirteen million, nine hundred twenty thousand, eight hundred forty".