139317928 has 16 divisors (see below), whose sum is σ = 261348480. Its totient is φ = 69625008.

The previous prime is 139317911. The next prime is 139317929. The reversal of 139317928 is 829713931.

It is not an unprimeable number, because it can be changed into a prime (139317929) 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, 25225 + ... + 30247.

It is an arithmetic number, because the mean of its divisors is an integer number (16334280).

Almost surely, 2^139317928 is an apocalyptic number.

It is an amenable number.

139317928 is a deficient number, since it is larger than the sum of its proper divisors (122030552).

139317928 is a wasteful number, since it uses less digits than its factorization.

139317928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8496 (or 8492 counting only the distinct ones).

The product of its digits is 81648, while the sum is 43.

The square root of 139317928 is about 11803.3015720179. The cubic root of 139317928 is about 518.4047858910.

It can be divided in two parts, 1393 and 17928, that added together give a square (19321 = 139²).

The spelling of 139317928 in words is "one hundred thirty-nine million, three hundred seventeen thousand, nine hundred twenty-eight".