18233428 has 12 divisors (see below), whose sum is σ = 32123700. Its totient is φ = 9055232.

The previous prime is 18233389. The next prime is 18233443. The reversal of 18233428 is 82433281.

It can be written as a sum of positive squares in 2 ways, for example, as 6822544 + 11410884 = 2612^2 + 3378^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18233428.

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, 14701 + ... + 15892.

It is an arithmetic number, because the mean of its divisors is an integer number (2676975).

Almost surely, 2^18233428 is an apocalyptic number.

It is an amenable number.

18233428 is a deficient number, since it is larger than the sum of its proper divisors (13890272).

18233428 is a wasteful number, since it uses less digits than its factorization.

18233428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30746 (or 30744 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 18233428 is about 4270.0618262503. The cubic root of 18233428 is about 263.2021558198.

The spelling of 18233428 in words is "eighteen million, two hundred thirty-three thousand, four hundred twenty-eight".