18690973 has 16 divisors (see below), whose sum is σ = 23604480. Its totient is φ = 14420736.

The previous prime is 18690961. The next prime is 18691021. The reversal of 18690973 is 37909681.

It is a cyclic number.

It is not a de Polignac number, because 18690973 - 2⁵ = 18690941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18690173) 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, 678 + ... + 6151.

It is an arithmetic number, because the mean of its divisors is an integer number (1475280).

Almost surely, 2^18690973 is an apocalyptic number.

It is an amenable number.

18690973 is a deficient number, since it is larger than the sum of its proper divisors (4913507).

18690973 is a wasteful number, since it uses less digits than its factorization.

18690973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6876.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 18690973 is about 4323.3057953376. The cubic root of 18690973 is about 265.3855690292.

The spelling of 18690973 in words is "eighteen million, six hundred ninety thousand, nine hundred seventy-three".