138215526 has 8 divisors (see below), whose sum is σ = 276431064. Its totient is φ = 46071840.

The previous prime is 138215513. The next prime is 138215531. The reversal of 138215526 is 625512831.

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

138215526 is an admirable number.

It is a congruent number.

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, 11517955 + ... + 11517966.

It is an arithmetic number, because the mean of its divisors is an integer number (34553883).

Almost surely, 2^138215526 is an apocalyptic number.

138215526 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138215526 is a wasteful number, since it uses less digits than its factorization.

138215526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23035926.

The product of its digits is 14400, while the sum is 33.

The square root of 138215526 is about 11756.5099413049. The cubic root of 138215526 is about 517.0338101293.

The spelling of 138215526 in words is "one hundred thirty-eight million, two hundred fifteen thousand, five hundred twenty-six".