138669825 has 24 divisors (see below), whose sum is σ = 262020928. Its totient is φ = 63391680.

The previous prime is 138669823. The next prime is 138669857. The reversal of 138669825 is 528966831.

It is a happy number.

It is not a de Polignac number, because 138669825 - 2¹ = 138669823 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138669823) 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, 131542 + ... + 132591.

Almost surely, 2^138669825 is an apocalyptic number.

138669825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138669825 is a deficient number, since it is larger than the sum of its proper divisors (123351103).

138669825 is a wasteful number, since it uses less digits than its factorization.

138669825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264153 (or 264148 counting only the distinct ones).

The product of its digits is 622080, while the sum is 48.

The square root of 138669825 is about 11775.8152584014. The cubic root of 138669825 is about 517.5996680771.

The spelling of 138669825 in words is "one hundred thirty-eight million, six hundred sixty-nine thousand, eight hundred twenty-five".