18634474 has 4 divisors (see below), whose sum is σ = 27951714. Its totient is φ = 9317236.

The previous prime is 18634433. The next prime is 18634481. The reversal of 18634474 is 47443681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14493249 + 4141225 = 3807^2 + 2035^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4658617 + ... + 4658620.

Almost surely, 2^18634474 is an apocalyptic number.

18634474 is a deficient number, since it is larger than the sum of its proper divisors (9317240).

18634474 is an equidigital number, since it uses as much as digits as its factorization.

18634474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9317239.

The product of its digits is 64512, while the sum is 37.

The square root of 18634474 is about 4316.7666140295. The cubic root of 18634474 is about 265.1178969887.

The spelling of 18634474 in words is "eighteen million, six hundred thirty-four thousand, four hundred seventy-four".