18438674 has 4 divisors (see below), whose sum is σ = 27658014. Its totient is φ = 9219336.

The previous prime is 18438649. The next prime is 18438689. The reversal of 18438674 is 47683481.

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., 11175649 + 7263025 = 3343^2 + 2695^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4609667 + ... + 4609670.

Almost surely, 2^18438674 is an apocalyptic number.

18438674 is a deficient number, since it is larger than the sum of its proper divisors (9219340).

18438674 is an equidigital number, since it uses as much as digits as its factorization.

18438674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9219339.

The product of its digits is 129024, while the sum is 41.

The square root of 18438674 is about 4294.0277129986. The cubic root of 18438674 is about 264.1860583884.

The spelling of 18438674 in words is "eighteen million, four hundred thirty-eight thousand, six hundred seventy-four".