138399530 has 8 divisors (see below), whose sum is σ = 249119172. Its totient is φ = 55359808.

The previous prime is 138399529. The next prime is 138399563. The reversal of 138399530 is 35993831.

It can be written as a sum of positive squares in 2 ways, for example, as 129572689 + 8826841 = 11383^2 + 2971^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6919967 + ... + 6919986.

Almost surely, 2^138399530 is an apocalyptic number.

138399530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138399530 is a deficient number, since it is larger than the sum of its proper divisors (110719642).

138399530 is a wasteful number, since it uses less digits than its factorization.

138399530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13839960.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 138399530 is about 11764.3329602660. The cubic root of 138399530 is about 517.2631478537.

The spelling of 138399530 in words is "one hundred thirty-eight million, three hundred ninety-nine thousand, five hundred thirty".