138252392 has 16 divisors (see below), whose sum is σ = 259575300. Its totient is φ = 69032320.

The previous prime is 138252391. The next prime is 138252397. The reversal of 138252392 is 293252831.

It can be written as a sum of positive squares in 2 ways, for example, as 77193796 + 61058596 = 8786^2 + 7814^2 .

It is a super-2 number, since 2×138252392² = 38227447787443328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138252391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5267 + ... + 17442.

Almost surely, 2^138252392 is an apocalyptic number.

It is an amenable number.

138252392 is a deficient number, since it is larger than the sum of its proper divisors (121322908).

138252392 is a wasteful number, since it uses less digits than its factorization.

138252392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23476 (or 23472 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 138252392 is about 11758.0777340516. The cubic root of 138252392 is about 517.0797752355.

The spelling of 138252392 in words is "one hundred thirty-eight million, two hundred fifty-two thousand, three hundred ninety-two".