138555825 has 24 divisors (see below), whose sum is σ = 232226208. Its totient is φ = 72881280.

The previous prime is 138555811. The next prime is 138555829. The reversal of 138555825 is 528555831.

It is not a de Polignac number, because 138555825 - 2¹⁸ = 138293681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138555829) 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, 7179 + ... + 18128.

It is an arithmetic number, because the mean of its divisors is an integer number (9676092).

Almost surely, 2^138555825 is an apocalyptic number.

138555825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138555825 is a deficient number, since it is larger than the sum of its proper divisors (93670383).

138555825 is a wasteful number, since it uses less digits than its factorization.

138555825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25393 (or 25388 counting only the distinct ones).

The product of its digits is 240000, while the sum is 42.

The square root of 138555825 is about 11770.9738339697. The cubic root of 138555825 is about 517.4577902047.

The spelling of 138555825 in words is "one hundred thirty-eight million, five hundred fifty-five thousand, eight hundred twenty-five".