13981928 has 16 divisors (see below), whose sum is σ = 26257380. Its totient is φ = 6979968.

The previous prime is 13981927. The next prime is 13981937. The reversal of 13981928 is 82918931.

13981928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 13823524 + 158404 = 3718^2 + 398^2 .

It is not an unprimeable number, because it can be changed into a prime (13981921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7100 + ... + 8852.

Almost surely, 2^13981928 is an apocalyptic number.

It is an amenable number.

13981928 is a deficient number, since it is larger than the sum of its proper divisors (12275452).

13981928 is a wasteful number, since it uses less digits than its factorization.

13981928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2756 (or 2752 counting only the distinct ones).

The product of its digits is 31104, while the sum is 41.

The square root of 13981928 is about 3739.2416343425. The cubic root of 13981928 is about 240.9104767842.

The spelling of 13981928 in words is "thirteen million, nine hundred eighty-one thousand, nine hundred twenty-eight".