139685025 has 24 divisors (see below), whose sum is σ = 238913280. Its totient is φ = 71928640.

The previous prime is 139685009. The next prime is 139685033. The reversal of 139685025 is 520586931.

139685025 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 139685025 - 2⁴ = 139685009 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29937 + ... + 34286.

It is an arithmetic number, because the mean of its divisors is an integer number (9954720).

Almost surely, 2^139685025 is an apocalyptic number.

139685025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139685025 is a deficient number, since it is larger than the sum of its proper divisors (99228255).

139685025 is a wasteful number, since it uses less digits than its factorization.

139685025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64265 (or 64260 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 39.

The square root of 139685025 is about 11818.8419483467. The cubic root of 139685025 is about 518.8597116382.

The spelling of 139685025 in words is "one hundred thirty-nine million, six hundred eighty-five thousand, twenty-five".