18872428 has 12 divisors (see below), whose sum is σ = 34092352. Its totient is φ = 9131760.

The previous prime is 18872419. The next prime is 18872429. The reversal of 18872428 is 82427881.

It is not an unprimeable number, because it can be changed into a prime (18872429) 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, 75975 + ... + 76222.

Almost surely, 2^18872428 is an apocalyptic number.

It is an amenable number.

18872428 is a deficient number, since it is larger than the sum of its proper divisors (15219924).

18872428 is a wasteful number, since it uses less digits than its factorization.

18872428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152232 (or 152230 counting only the distinct ones).

The product of its digits is 57344, while the sum is 40.

The square root of 18872428 is about 4344.2407852236. The cubic root of 18872428 is about 266.2416068534.

The spelling of 18872428 in words is "eighteen million, eight hundred seventy-two thousand, four hundred twenty-eight".