139479925 has 18 divisors (see below), whose sum is σ = 187288422. Its totient is φ = 102997440.

The previous prime is 139479911. The next prime is 139479929. The reversal of 139479925 is 529974931.

It can be written as a sum of positive squares in 9 ways, for example, as 111028369 + 28451556 = 10537^2 + 5334^2 .

It is not a de Polignac number, because 139479925 - 2⁹ = 139479413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139479929) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 12282 + ... + 20731.

Almost surely, 2^139479925 is an apocalyptic number.

It is an amenable number.

139479925 is a deficient number, since it is larger than the sum of its proper divisors (47808497).

139479925 is a wasteful number, since it uses less digits than its factorization.

139479925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33049 (or 33031 counting only the distinct ones).

The product of its digits is 612360, while the sum is 49.

The square root of 139479925 is about 11810.1619379245. The cubic root of 139479925 is about 518.6056394161.

The spelling of 139479925 in words is "one hundred thirty-nine million, four hundred seventy-nine thousand, nine hundred twenty-five".