18640970 has 32 divisors (see below), whose sum is σ = 34933248. Its totient is φ = 7155648.

The previous prime is 18640967. The next prime is 18640987. The reversal of 18640970 is 7904681.

It is a self number, because there is not a number n which added to its sum of digits gives 18640970.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30407 + ... + 31013.

It is an arithmetic number, because the mean of its divisors is an integer number (1091664).

Almost surely, 2^18640970 is an apocalyptic number.

18640970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18640970 is a deficient number, since it is larger than the sum of its proper divisors (16292278).

18640970 is a wasteful number, since it uses less digits than its factorization.

18640970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 18640970 is about 4317.5189634789. The cubic root of 18640970 is about 265.1487002153.

The spelling of 18640970 in words is "eighteen million, six hundred forty thousand, nine hundred seventy".