18233640 has 64 divisors (see below), whose sum is σ = 60782400. Its totient is φ = 4862016.

The previous prime is 18233617. The next prime is 18233653. The reversal of 18233640 is 4633281.

It is a happy number.

18233640 is a `hidden beast` number, since 18 + 2 + 3 + 3 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7362 + ... + 9521.

It is an arithmetic number, because the mean of its divisors is an integer number (949725).

Almost surely, 2^18233640 is an apocalyptic number.

18233640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18233640 is an abundant number, since it is smaller than the sum of its proper divisors (42548760).

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

18233640 is a wasteful number, since it uses less digits than its factorization.

18233640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16903 (or 16893 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 18233640 is about 4270.0866501747. The cubic root of 18233640 is about 263.2031758993.

The spelling of 18233640 in words is "eighteen million, two hundred thirty-three thousand, six hundred forty".