18640946 has 8 divisors (see below), whose sum is σ = 27979884. Its totient is φ = 9314320.

The previous prime is 18640931. The next prime is 18640949. The reversal of 18640946 is 64904681.

It can be written as a sum of positive squares in 2 ways, for example, as 17850625 + 790321 = 4225^2 + 889^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18640949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3656 + ... + 7116.

Almost surely, 2^18640946 is an apocalyptic number.

18640946 is a deficient number, since it is larger than the sum of its proper divisors (9338938).

18640946 is a wasteful number, since it uses less digits than its factorization.

18640946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6156.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 18640946 is about 4317.5161841040. The cubic root of 18640946 is about 265.1485864235.

The spelling of 18640946 in words is "eighteen million, six hundred forty thousand, nine hundred forty-six".