17957979 has 12 divisors (see below), whose sum is σ = 27934816. Its totient is φ = 11050992.

The previous prime is 17957969. The next prime is 17957981. The reversal of 17957979 is 97975971.

It is not a de Polignac number, because 17957979 - 2¹² = 17953883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (17957909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76627 + ... + 76860.

Almost surely, 2^17957979 is an apocalyptic number.

17957979 is a deficient number, since it is larger than the sum of its proper divisors (9976837).

17957979 is a wasteful number, since it uses less digits than its factorization.

17957979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153506 (or 153503 counting only the distinct ones).

The product of its digits is 1250235, while the sum is 54.

The square root of 17957979 is about 4237.6855711579. The cubic root of 17957979 is about 261.8700431580.

The spelling of 17957979 in words is "seventeen million, nine hundred fifty-seven thousand, nine hundred seventy-nine".