18477312 has 108 divisors (see below), whose sum is σ = 57321936. Its totient is φ = 5268480.

The previous prime is 18477311. The next prime is 18477313. The reversal of 18477312 is 21377481.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18477311) and next prime (18477313).

It is a super-2 number, since 2×18477312² = 682822117490688, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is not an unprimeable number, because it can be changed into a prime (18477311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37387 + ... + 37877.

Almost surely, 2^18477312 is an apocalyptic number.

18477312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18477312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28660968).

18477312 is an abundant number, since it is smaller than the sum of its proper divisors (38844624).

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

18477312 is an equidigital number, since it uses as much as digits as its factorization.

18477312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524 (or 503 counting only the distinct ones).

The product of its digits is 9408, while the sum is 33.

The square root of 18477312 is about 4298.5243979766. The cubic root of 18477312 is about 264.3704624520.

The spelling of 18477312 in words is "eighteen million, four hundred seventy-seven thousand, three hundred twelve".