138236625 has 112 divisors (see below), whose sum is σ = 272130768. Its totient is φ = 69984000.

The previous prime is 138236599. The next prime is 138236627. The reversal of 138236625 is 526632831.

It is a happy number.

138236625 is a `hidden beast` number, since 1 + 3 + 8 + 23 + 6 + 625 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 51969681 + 86266944 = 7209^2 + 9288^2 .

It is not a de Polignac number, because 138236625 - 2⁸ = 138236369 is a prime.

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 138236625.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138236627) by changing a digit.

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 111 ways as a sum of consecutive naturals, for example, 3371605 + ... + 3371645.

It is an arithmetic number, because the mean of its divisors is an integer number (2429739).

Almost surely, 2^138236625 is an apocalyptic number.

138236625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138236625 is a deficient number, since it is larger than the sum of its proper divisors (133894143).

138236625 is an frugal number, since it uses more digits than its factorization.

138236625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 86 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 138236625 is about 11757.4072396936. The cubic root of 138236625 is about 517.0601176932.

The spelling of 138236625 in words is "one hundred thirty-eight million, two hundred thirty-six thousand, six hundred twenty-five".