18500428 has 12 divisors (see below), whose sum is σ = 33420352. Its totient is φ = 8951760.

The previous prime is 18500413. The next prime is 18500431. The reversal of 18500428 is 82400581.

It is a junction number, because it is equal to n+sod(n) for n = 18500396 and 18500405.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74475 + ... + 74722.

Almost surely, 2^18500428 is an apocalyptic number.

It is an amenable number.

18500428 is a deficient number, since it is larger than the sum of its proper divisors (14919924).

18500428 is a wasteful number, since it uses less digits than its factorization.

18500428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149232 (or 149230 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 18500428 is about 4301.2123872229. The cubic root of 18500428 is about 264.4806632019.

The spelling of 18500428 in words is "eighteen million, five hundred thousand, four hundred twenty-eight".