18347472 has 210 divisors, whose sum is σ = 63090146. Its totient is φ = 5132160.

The previous prime is 18347423. The next prime is 18347479. The reversal of 18347472 is 27474381.

It is a happy number.

18347472 is a `hidden beast` number, since 183 + 4 + 7 + 472 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12702096 + 5645376 = 3564^2 + 2376^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18347479) by changing a digit.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 1411338 + ... + 1411350.

Almost surely, 2^18347472 is an apocalyptic number.

18347472 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 18347472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31545073).

18347472 is an abundant number, since it is smaller than the sum of its proper divisors (44742674).

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

18347472 is a wasteful number, since it uses less digits than its factorization.

18347472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61 (or 29 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 18347472 is about 4283.3949152512. The cubic root of 18347472 is about 263.7497628832.

The spelling of 18347472 in words is "eighteen million, three hundred forty-seven thousand, four hundred seventy-two".