18311716 has 6 divisors (see below), whose sum is σ = 32045510. Its totient is φ = 9155856.

The previous prime is 18311693. The next prime is 18311719. The reversal of 18311716 is 61711381.

It can be written as a sum of positive squares in only one way, i.e., 15178816 + 3132900 = 3896^2 + 1770^2 .

It is not an unprimeable number, because it can be changed into a prime (18311719) by changing a digit.

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, 2288961 + ... + 2288968.

Almost surely, 2^18311716 is an apocalyptic number.

It is an amenable number.

18311716 is a deficient number, since it is larger than the sum of its proper divisors (13733794).

18311716 is a wasteful number, since it uses less digits than its factorization.

18311716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4577933 (or 4577931 counting only the distinct ones).

The product of its digits is 1008, while the sum is 28.

The square root of 18311716 is about 4279.2190876374. The cubic root of 18311716 is about 263.5783174768.

The spelling of 18311716 in words is "eighteen million, three hundred eleven thousand, seven hundred sixteen".