13891980 has 24 divisors (see below), whose sum is σ = 38897712. Its totient is φ = 3704512.

The previous prime is 13891979. The next prime is 13891987. The reversal of 13891980 is 8919831.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (13891987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115707 + ... + 115826.

It is an arithmetic number, because the mean of its divisors is an integer number (1620738).

Almost surely, 2^13891980 is an apocalyptic number.

13891980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13891980 is an abundant number, since it is smaller than the sum of its proper divisors (25005732).

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

13891980 is a wasteful number, since it uses less digits than its factorization.

13891980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231545 (or 231543 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 13891980 is about 3727.1946555016. The cubic root of 13891980 is about 240.3927596765.

The spelling of 13891980 in words is "thirteen million, eight hundred ninety-one thousand, nine hundred eighty".