18331274 has 16 divisors (see below), whose sum is σ = 29733480. Its totient is φ = 8425920.

The previous prime is 18331259. The next prime is 18331279. The reversal of 18331274 is 47213381.

It can be written as a sum of positive squares in 4 ways, for example, as 11175649 + 7155625 = 3343^2 + 2675^2 .

It is not an unprimeable number, because it can be changed into a prime (18331279) 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 in 7 ways as a sum of consecutive naturals, for example, 5684 + ... + 8304.

Almost surely, 2^18331274 is an apocalyptic number.

18331274 is a deficient number, since it is larger than the sum of its proper divisors (11402206).

18331274 is a wasteful number, since it uses less digits than its factorization.

18331274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2905.

The product of its digits is 4032, while the sum is 29.

The square root of 18331274 is about 4281.5037078111. The cubic root of 18331274 is about 263.6721231860.

The spelling of 18331274 in words is "eighteen million, three hundred thirty-one thousand, two hundred seventy-four".