138650979 has 8 divisors (see below), whose sum is σ = 185352192. Its totient is φ = 92191880.

The previous prime is 138650977. The next prime is 138650983. The reversal of 138650979 is 979056831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138650979 - 2¹ = 138650977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138650977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59187 + ... + 61484.

It is an arithmetic number, because the mean of its divisors is an integer number (23169024).

Almost surely, 2^138650979 is an apocalyptic number.

138650979 is a deficient number, since it is larger than the sum of its proper divisors (46701213).

138650979 is a wasteful number, since it uses less digits than its factorization.

138650979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121057.

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 138650979 is about 11775.0150318375. The cubic root of 138650979 is about 517.5762187908.

The spelling of 138650979 in words is "one hundred thirty-eight million, six hundred fifty thousand, nine hundred seventy-nine".