18924428 has 12 divisors (see below), whose sum is σ = 33245520. Its totient is φ = 9425712.

The previous prime is 18924421. The next prime is 18924431. The reversal of 18924428 is 82442981.

It is a junction number, because it is equal to n+sod(n) for n = 18924391 and 18924400.

It is not an unprimeable number, because it can be changed into a prime (18924421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7943 + ... + 10046.

It is an arithmetic number, because the mean of its divisors is an integer number (2770460).

Almost surely, 2^18924428 is an apocalyptic number.

It is an amenable number.

18924428 is a deficient number, since it is larger than the sum of its proper divisors (14321092).

18924428 is a wasteful number, since it uses less digits than its factorization.

18924428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18256 (or 18254 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 18924428 is about 4350.2216035508. The cubic root of 18924428 is about 266.4859115339.

The spelling of 18924428 in words is "eighteen million, nine hundred twenty-four thousand, four hundred twenty-eight".