138252393 has 8 divisors (see below), whose sum is σ = 204818400. Its totient is φ = 92168244.

The previous prime is 138252391. The next prime is 138252397. The reversal of 138252393 is 393252831.

138252393 is a `hidden beast` number, since 13 + 8 + 252 + 393 = 666.

It is not a de Polignac number, because 138252393 - 2¹ = 138252391 is a prime.

It is a super-2 number, since 2×138252393² = 38227448340452898, 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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2560203 + ... + 2560256.

It is an arithmetic number, because the mean of its divisors is an integer number (25602300).

Almost surely, 2^138252393 is an apocalyptic number.

It is an amenable number.

138252393 is a deficient number, since it is larger than the sum of its proper divisors (66566007).

138252393 is an equidigital number, since it uses as much as digits as its factorization.

138252393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5120468 (or 5120462 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 138252393 is about 11758.0777765756. The cubic root of 138252393 is about 517.0797764822.

The spelling of 138252393 in words is "one hundred thirty-eight million, two hundred fifty-two thousand, three hundred ninety-three".