138215798 has 32 divisors (see below), whose sum is σ = 246196800. Its totient is φ = 56939904.

The previous prime is 138215789. The next prime is 138215801. The reversal of 138215798 is 897512831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111848 + ... + 113076.

It is an arithmetic number, because the mean of its divisors is an integer number (7693650).

Almost surely, 2^138215798 is an apocalyptic number.

138215798 is a deficient number, since it is larger than the sum of its proper divisors (107981002).

138215798 is a wasteful number, since it uses less digits than its factorization.

138215798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1544.

The product of its digits is 120960, while the sum is 44.

The square root of 138215798 is about 11756.5215093581. The cubic root of 138215798 is about 517.0341492931.

The spelling of 138215798 in words is "one hundred thirty-eight million, two hundred fifteen thousand, seven hundred ninety-eight".