138899173 has 6 divisors (see below), whose sum is σ = 161576646. Its totient is φ = 119056392.

The previous prime is 138899171. The next prime is 138899191. The reversal of 138899173 is 371998831.

It can be written as a sum of positive squares in only one way, i.e., 136819809 + 2079364 = 11697^2 + 1442^2 .

It is not a de Polignac number, because 138899173 - 2¹ = 138899171 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 2834677 = 138899173 / (1 + 3 + 8 + 8 + 9 + 9 + 1 + 7 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138899171) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1417290 + ... + 1417387.

It is an arithmetic number, because the mean of its divisors is an integer number (26929441).

Almost surely, 2^138899173 is an apocalyptic number.

It is an amenable number.

138899173 is a deficient number, since it is larger than the sum of its proper divisors (22677473).

138899173 is an equidigital number, since it uses as much as digits as its factorization.

138899173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2834691 (or 2834684 counting only the distinct ones).

The product of its digits is 326592, while the sum is 49.

The square root of 138899173 is about 11785.5493295815. The cubic root of 138899173 is about 517.8848660599.

The spelling of 138899173 in words is "one hundred thirty-eight million, eight hundred ninety-nine thousand, one hundred seventy-three".