17980857 has 12 divisors (see below), whose sum is σ = 26360880. Its totient is φ = 11807928.

The previous prime is 17980847. The next prime is 17980861. The reversal of 17980857 is 75808971.

It is not a de Polignac number, because 17980857 - 2¹⁴ = 17964473 is a prime.

It is a super-2 number, since 2×17980857² = 646622436908898, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (17980847) 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 11 ways as a sum of consecutive naturals, for example, 14307 + ... + 15512.

It is an arithmetic number, because the mean of its divisors is an integer number (2196740).

Almost surely, 2^17980857 is an apocalyptic number.

It is an amenable number.

17980857 is a deficient number, since it is larger than the sum of its proper divisors (8380023).

17980857 is a wasteful number, since it uses less digits than its factorization.

17980857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29892 (or 29889 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 17980857 is about 4240.3840627943. The cubic root of 17980857 is about 261.9812011841.

The spelling of 17980857 in words is "seventeen million, nine hundred eighty thousand, eight hundred fifty-seven".