18207312 has 20 divisors (see below), whose sum is σ = 47035680. Its totient is φ = 6069088.

The previous prime is 18207307. The next prime is 18207347. The reversal of 18207312 is 21370281.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 189612 + ... + 189707.

It is an arithmetic number, because the mean of its divisors is an integer number (2351784).

Almost surely, 2^18207312 is an apocalyptic number.

18207312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18207312 is an abundant number, since it is smaller than the sum of its proper divisors (28828368).

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

18207312 is a wasteful number, since it uses less digits than its factorization.

18207312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379330 (or 379324 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 18207312 is about 4267.0026951011. The cubic root of 18207312 is about 263.0764330370.

Adding to 18207312 its reverse (21370281), we get a palindrome (39577593).

The spelling of 18207312 in words is "eighteen million, two hundred seven thousand, three hundred twelve".