123139725 has 12 divisors (see below), whose sum is σ = 203591136. Its totient is φ = 65674480.

The previous prime is 123139699. The next prime is 123139733. The reversal of 123139725 is 527931321.

It is not a de Polignac number, because 123139725 - 2⁶ = 123139661 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 820857 + ... + 821006.

It is an arithmetic number, because the mean of its divisors is an integer number (16965928).

Almost surely, 2^123139725 is an apocalyptic number.

123139725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123139725 is a deficient number, since it is larger than the sum of its proper divisors (80451411).

123139725 is a wasteful number, since it uses less digits than its factorization.

123139725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641876 (or 1641871 counting only the distinct ones).

The product of its digits is 11340, while the sum is 33.

The square root of 123139725 is about 11096.8340079502. The cubic root of 123139725 is about 497.5072261435.

The spelling of 123139725 in words is "one hundred twenty-three million, one hundred thirty-nine thousand, seven hundred twenty-five".