18431716 has 6 divisors (see below), whose sum is σ = 32255510. Its totient is φ = 9215856.

The previous prime is 18431711. The next prime is 18431731. The reversal of 18431716 is 61713481.

It can be written as a sum of positive squares in only one way, i.e., 11249316 + 7182400 = 3354^2 + 2680^2 .

It is not an unprimeable number, because it can be changed into a prime (18431711) 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, 2303961 + ... + 2303968.

Almost surely, 2^18431716 is an apocalyptic number.

It is an amenable number.

18431716 is a deficient number, since it is larger than the sum of its proper divisors (13823794).

18431716 is a wasteful number, since it uses less digits than its factorization.

18431716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4607933 (or 4607931 counting only the distinct ones).

The product of its digits is 4032, while the sum is 31.

The square root of 18431716 is about 4293.2174415000. The cubic root of 18431716 is about 264.1528232100.

The spelling of 18431716 in words is "eighteen million, four hundred thirty-one thousand, seven hundred sixteen".