138784198 has 32 divisors (see below), whose sum is σ = 249292800. Its totient is φ = 56687904.

The previous prime is 138784187. The next prime is 138784207. The reversal of 138784198 is 891487831.

It is a super-2 number, since 2×138784198² = 38522107229006408, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29911 + ... + 34237.

It is an arithmetic number, because the mean of its divisors is an integer number (7790400).

Almost surely, 2^138784198 is an apocalyptic number.

138784198 is a deficient number, since it is larger than the sum of its proper divisors (110508602).

138784198 is a wasteful number, since it uses less digits than its factorization.

138784198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4444.

The product of its digits is 387072, while the sum is 49.

The square root of 138784198 is about 11780.6705242104. The cubic root of 138784198 is about 517.7419320451.

The spelling of 138784198 in words is "one hundred thirty-eight million, seven hundred eighty-four thousand, one hundred ninety-eight".