18970931 has 8 divisors (see below), whose sum is σ = 21896544. Its totient is φ = 16099200.

The previous prime is 18970927. The next prime is 18970933. The reversal of 18970931 is 13907981.

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 18970931 - 2² = 18970927 is a prime.

It is a super-2 number, since 2×18970931² = 719792446013522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18970933) 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, 12710 + ... + 14123.

It is an arithmetic number, because the mean of its divisors is an integer number (2737068).

Almost surely, 2^18970931 is an apocalyptic number.

18970931 is a deficient number, since it is larger than the sum of its proper divisors (2925613).

18970931 is a wasteful number, since it uses less digits than its factorization.

18970931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26941.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 18970931 is about 4355.5632241996. The cubic root of 18970931 is about 266.7040116101.

The spelling of 18970931 in words is "eighteen million, nine hundred seventy thousand, nine hundred thirty-one".