18402328 has 32 divisors (see below), whose sum is σ = 39584160. Its totient is φ = 7856640.

The previous prime is 18402311. The next prime is 18402337. The reversal of 18402328 is 82320481.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 18402296 and 18402305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20448 + ... + 21328.

It is an arithmetic number, because the mean of its divisors is an integer number (1237005).

Almost surely, 2^18402328 is an apocalyptic number.

It is an amenable number.

18402328 is an abundant number, since it is smaller than the sum of its proper divisors (21181832).

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

18402328 is a wasteful number, since it uses less digits than its factorization.

18402328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1267 (or 1263 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 18402328 is about 4289.7934682220. The cubic root of 18402328 is about 264.0123578543.

The spelling of 18402328 in words is "eighteen million, four hundred two thousand, three hundred twenty-eight".