138765525 has 24 divisors (see below), whose sum is σ = 235026624. Its totient is φ = 72201600.

The previous prime is 138765521. The next prime is 138765547. The reversal of 138765525 is 525567831.

It is not a de Polignac number, because 138765525 - 2² = 138765521 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138765521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19489 + ... + 25638.

It is an arithmetic number, because the mean of its divisors is an integer number (9792776).

Almost surely, 2^138765525 is an apocalyptic number.

138765525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138765525 is a deficient number, since it is larger than the sum of its proper divisors (96261099).

138765525 is a wasteful number, since it uses less digits than its factorization.

138765525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45181 (or 45176 counting only the distinct ones).

The product of its digits is 252000, while the sum is 42.

The square root of 138765525 is about 11779.8779705055. The cubic root of 138765525 is about 517.7187107926.

The spelling of 138765525 in words is "one hundred thirty-eight million, seven hundred sixty-five thousand, five hundred twenty-five".