18508474 has 4 divisors (see below), whose sum is σ = 27762714. Its totient is φ = 9254236.

The previous prime is 18508471. The next prime is 18508481. The reversal of 18508474 is 47480581.

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., 11512449 + 6996025 = 3393^2 + 2645^2 .

It is not an unprimeable number, because it can be changed into a prime (18508471) by changing a digit.

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, 4627117 + ... + 4627120.

Almost surely, 2^18508474 is an apocalyptic number.

18508474 is a deficient number, since it is larger than the sum of its proper divisors (9254240).

18508474 is an equidigital number, since it uses as much as digits as its factorization.

18508474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9254239.

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 18508474 is about 4302.1476032326. The cubic root of 18508474 is about 264.5189993058.

The spelling of 18508474 in words is "eighteen million, five hundred eight thousand, four hundred seventy-four".