138931199 has 16 divisors (see below), whose sum is σ = 157295520. Its totient is φ = 121551360.

The previous prime is 138931193. The next prime is 138931207. The reversal of 138931199 is 991139831.

It is a cyclic number.

It is not a de Polignac number, because 138931199 - 2⁴ = 138931183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138931193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145307 + ... + 146259.

It is an arithmetic number, because the mean of its divisors is an integer number (9830970).

Almost surely, 2^138931199 is an apocalyptic number.

138931199 is a deficient number, since it is larger than the sum of its proper divisors (18364321).

138931199 is a wasteful number, since it uses less digits than its factorization.

138931199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450.

The product of its digits is 52488, while the sum is 44.

The square root of 138931199 is about 11786.9079490764. The cubic root of 138931199 is about 517.9246659277.

The spelling of 138931199 in words is "one hundred thirty-eight million, nine hundred thirty-one thousand, one hundred ninety-nine".