18319668 has 12 divisors (see below), whose sum is σ = 42745920. Its totient is φ = 6106552.

The previous prime is 18319643. The next prime is 18319669. The reversal of 18319668 is 86691381.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×18319668³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18319669) 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 in 3 ways as a sum of consecutive naturals, for example, 763308 + ... + 763331.

It is an arithmetic number, because the mean of its divisors is an integer number (3562160).

Almost surely, 2^18319668 is an apocalyptic number.

It is an amenable number.

18319668 is an abundant number, since it is smaller than the sum of its proper divisors (24426252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18319668 is a wasteful number, since it uses less digits than its factorization.

18319668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526646 (or 1526644 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 18319668 is about 4280.1481282778. The cubic root of 18319668 is about 263.6164655757.

The spelling of 18319668 in words is "eighteen million, three hundred nineteen thousand, six hundred sixty-eight".