18660380 has 12 divisors (see below), whose sum is σ = 39186840. Its totient is φ = 7464144.

The previous prime is 18660377. The next prime is 18660401. The reversal of 18660380 is 8306681.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466490 + ... + 466529.

It is an arithmetic number, because the mean of its divisors is an integer number (3265570).

Almost surely, 2^18660380 is an apocalyptic number.

18660380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18660380 is an abundant number, since it is smaller than the sum of its proper divisors (20526460).

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

18660380 is a wasteful number, since it uses less digits than its factorization.

18660380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933028 (or 933026 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 18660380 is about 4319.7661973769. The cubic root of 18660380 is about 265.2406974132.

The spelling of 18660380 in words is "eighteen million, six hundred sixty thousand, three hundred eighty".