137908979 has 4 divisors (see below), whose sum is σ = 148517376. Its totient is φ = 127300584.

The previous prime is 137908963. The next prime is 137908993. The reversal of 137908979 is 979809731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 979809731 = 563 ⋅1740337.

It is a cyclic number.

It is not a de Polignac number, because 137908979 - 2⁴ = 137908963 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 137908979.

It is not an unprimeable number, because it can be changed into a prime (137908679) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5304179 + ... + 5304204.

It is an arithmetic number, because the mean of its divisors is an integer number (37129344).

Almost surely, 2^137908979 is an apocalyptic number.

137908979 is a deficient number, since it is larger than the sum of its proper divisors (10608397).

137908979 is a wasteful number, since it uses less digits than its factorization.

137908979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10608396.

The product of its (nonzero) digits is 857304, while the sum is 53.

The square root of 137908979 is about 11743.4653744114. The cubic root of 137908979 is about 516.6512856099.

The spelling of 137908979 in words is "one hundred thirty-seven million, nine hundred eight thousand, nine hundred seventy-nine".