138353215 has 72 divisors (see below), whose sum is σ = 229249440. Its totient is φ = 79390080.

The previous prime is 138353209. The next prime is 138353251. The reversal of 138353215 is 512353831.

It is not a de Polignac number, because 138353215 - 2⁷ = 138353087 is a prime.

It is a super-2 number, since 2×138353215² = 38283224201672450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 385206 + ... + 385564.

It is an arithmetic number, because the mean of its divisors is an integer number (3184020).

Almost surely, 2^138353215 is an apocalyptic number.

138353215 is a deficient number, since it is larger than the sum of its proper divisors (90896225).

138353215 is a wasteful number, since it uses less digits than its factorization.

138353215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413 (or 395 counting only the distinct ones).

The product of its digits is 10800, while the sum is 31.

The square root of 138353215 is about 11762.3643456577. The cubic root of 138353215 is about 517.2054412137.

It can be divided in two parts, 138 and 353215, that added together give a palindrome (353353).

The spelling of 138353215 in words is "one hundred thirty-eight million, three hundred fifty-three thousand, two hundred fifteen".