138055979 has 16 divisors (see below), whose sum is σ = 148569120. Its totient is φ = 128029440.

The previous prime is 138055877. The next prime is 138055987. The reversal of 138055979 is 979550831.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138055979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138055279) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78797 + ... + 80529.

It is an arithmetic number, because the mean of its divisors is an integer number (9285570).

Almost surely, 2^138055979 is an apocalyptic number.

138055979 is a deficient number, since it is larger than the sum of its proper divisors (10513141).

138055979 is a wasteful number, since it uses less digits than its factorization.

138055979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870.

The product of its (nonzero) digits is 340200, while the sum is 47.

The square root of 138055979 is about 11749.7225073616. The cubic root of 138055979 is about 516.8347901473.

The spelling of 138055979 in words is "one hundred thirty-eight million, fifty-five thousand, nine hundred seventy-nine".