13977931 has 16 divisors (see below), whose sum is σ = 15897600. Its totient is φ = 12175200.

The previous prime is 13977923. The next prime is 13977949.

It is a happy number.

13977931 is nontrivially palindromic in base 10.

13977931 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 13977931 - 2³ = 13977923 is a prime.

It is a super-2 number, since 2×13977931² = 390765110081522, which contains 22 as substring.

It is a Duffinian number.

13977931 is a Rhonda number in base 6.

It is not an unprimeable number, because it can be changed into a prime (13971931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60925 + ... + 61153.

It is an arithmetic number, because the mean of its divisors is an integer number (993600).

Almost surely, 2^13977931 is an apocalyptic number.

13977931 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13977931 is a deficient number, since it is larger than the sum of its proper divisors (1919669).

13977931 is a wasteful number, since it uses less digits than its factorization.

13977931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450.

The product of its digits is 35721, while the sum is 40.

The square root of 13977931 is about 3738.7071294767. The cubic root of 13977931 is about 240.8875183160.

The spelling of 13977931 in words is "thirteen million, nine hundred seventy-seven thousand, nine hundred thirty-one".