18688368 has 40 divisors (see below), whose sum is σ = 49104000. Its totient is φ = 6122944.

The previous prime is 18688357. The next prime is 18688391. The reversal of 18688368 is 86388681.

It is a happy number.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 468 + ... + 6131.

It is an arithmetic number, because the mean of its divisors is an integer number (1227600).

Almost surely, 2^18688368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18688368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24552000).

18688368 is an abundant number, since it is smaller than the sum of its proper divisors (30415632).

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

18688368 is a wasteful number, since it uses less digits than its factorization.

18688368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6669 (or 6663 counting only the distinct ones).

The product of its digits is 442368, while the sum is 48.

The square root of 18688368 is about 4323.0045107541. The cubic root of 18688368 is about 265.3732393424.

The spelling of 18688368 in words is "eighteen million, six hundred eighty-eight thousand, three hundred sixty-eight".