138877625 has 8 divisors (see below), whose sum is σ = 173319432. Its totient is φ = 111102000.

The previous prime is 138877597. The next prime is 138877637. The reversal of 138877625 is 526778831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15578809 + 123298816 = 3947^2 + 11104^2 .

It is not a de Polignac number, because 138877625 - 2⁶ = 138877561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 138877625.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 555386 + ... + 555635.

It is an arithmetic number, because the mean of its divisors is an integer number (21664929).

Almost surely, 2^138877625 is an apocalyptic number.

It is an amenable number.

138877625 is a deficient number, since it is larger than the sum of its proper divisors (34441807).

138877625 is an equidigital number, since it uses as much as digits as its factorization.

138877625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111036 (or 1111026 counting only the distinct ones).

The product of its digits is 564480, while the sum is 47.

The square root of 138877625 is about 11784.6351237533. The cubic root of 138877625 is about 517.8580841385.

It can be divided in two parts, 13887 and 7625, that added together give a palindrome (21512).

The spelling of 138877625 in words is "one hundred thirty-eight million, eight hundred seventy-seven thousand, six hundred twenty-five".