138742725 has 48 divisors (see below), whose sum is σ = 256126464. Its totient is φ = 65688000.

The previous prime is 138742697. The next prime is 138742741. The reversal of 138742725 is 527247831.

It is not a de Polignac number, because 138742725 - 2⁸ = 138742469 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33520 + ... + 37430.

It is an arithmetic number, because the mean of its divisors is an integer number (5335968).

Almost surely, 2^138742725 is an apocalyptic number.

138742725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138742725 is a deficient number, since it is larger than the sum of its proper divisors (117383739).

138742725 is a wasteful number, since it uses less digits than its factorization.

138742725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3978 (or 3973 counting only the distinct ones).

The product of its digits is 94080, while the sum is 39.

The square root of 138742725 is about 11778.9101787899. The cubic root of 138742725 is about 517.6903544864.

The spelling of 138742725 in words is "one hundred thirty-eight million, seven hundred forty-two thousand, seven hundred twenty-five".