18488474 has 4 divisors (see below), whose sum is σ = 27732714. Its totient is φ = 9244236.

The previous prime is 18488447. The next prime is 18488489. The reversal of 18488474 is 47488481.

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., 15547249 + 2941225 = 3943^2 + 1715^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4622117 + ... + 4622120.

Almost surely, 2^18488474 is an apocalyptic number.

18488474 is a deficient number, since it is larger than the sum of its proper divisors (9244240).

18488474 is an equidigital number, since it uses as much as digits as its factorization.

18488474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9244239.

The product of its digits is 229376, while the sum is 44.

The square root of 18488474 is about 4299.8225544783. The cubic root of 18488474 is about 264.4236864471.

The spelling of 18488474 in words is "eighteen million, four hundred eighty-eight thousand, four hundred seventy-four".