13939780 has 12 divisors (see below), whose sum is σ = 29273580. Its totient is φ = 5575904.

The previous prime is 13939769. The next prime is 13939831. The reversal of 13939780 is 8793931.

It can be written as a sum of positive squares in 2 ways, for example, as 2119936 + 11819844 = 1456^2 + 3438^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348475 + ... + 348514.

It is an arithmetic number, because the mean of its divisors is an integer number (2439465).

Almost surely, 2^13939780 is an apocalyptic number.

13939780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13939780 is an abundant number, since it is smaller than the sum of its proper divisors (15333800).

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

13939780 is a wasteful number, since it uses less digits than its factorization.

13939780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696998 (or 696996 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 13939780 is about 3733.6014784655. The cubic root of 13939780 is about 240.6681612575.

The spelling of 13939780 in words is "thirteen million, nine hundred thirty-nine thousand, seven hundred eighty".