13977928 has 16 divisors (see below), whose sum is σ = 27348480. Its totient is φ = 6685008.

The previous prime is 13977923. The next prime is 13977949. The reversal of 13977928 is 82977931.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is not an unprimeable number, because it can be changed into a prime (13977923) 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, 37800 + ... + 38167.

It is an arithmetic number, because the mean of its divisors is an integer number (1709280).

Almost surely, 2^13977928 is an apocalyptic number.

It is an amenable number.

13977928 is a deficient number, since it is larger than the sum of its proper divisors (13370552).

13977928 is a wasteful number, since it uses less digits than its factorization.

13977928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75996 (or 75992 counting only the distinct ones).

The product of its digits is 190512, while the sum is 46.

The square root of 13977928 is about 3738.7067282685. The cubic root of 13977928 is about 240.8875010826.

It can be divided in two parts, 1397792 and 8, that multiplied together give a square (11182336 = 3344²).

The spelling of 13977928 in words is "thirteen million, nine hundred seventy-seven thousand, nine hundred twenty-eight".