18940668 has 12 divisors (see below), whose sum is σ = 44194920. Its totient is φ = 6313552.

The previous prime is 18940667. The next prime is 18940687. The reversal of 18940668 is 86604981.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18940667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 789183 + ... + 789206.

It is an arithmetic number, because the mean of its divisors is an integer number (3682910).

Almost surely, 2^18940668 is an apocalyptic number.

It is an amenable number.

18940668 is an abundant number, since it is smaller than the sum of its proper divisors (25254252).

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

18940668 is a wasteful number, since it uses less digits than its factorization.

18940668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578396 (or 1578394 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 18940668 is about 4352.0877748501. The cubic root of 18940668 is about 266.5621180441.

The spelling of 18940668 in words is "eighteen million, nine hundred forty thousand, six hundred sixty-eight".