18973128 has 16 divisors (see below), whose sum is σ = 47432880. Its totient is φ = 6324368.

The previous prime is 18973093. The next prime is 18973151. The reversal of 18973128 is 82137981.

It is a super-2 number, since 2×18973128² = 719959172208768, which contains 22 as substring.

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, 395250 + ... + 395297.

It is an arithmetic number, because the mean of its divisors is an integer number (2964555).

Almost surely, 2^18973128 is an apocalyptic number.

It is an amenable number.

18973128 is an abundant number, since it is smaller than the sum of its proper divisors (28459752).

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

18973128 is a wasteful number, since it uses less digits than its factorization.

18973128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790556 (or 790552 counting only the distinct ones).

The product of its digits is 24192, while the sum is 39.

The square root of 18973128 is about 4355.8154230867. The cubic root of 18973128 is about 266.7143067663.

The spelling of 18973128 in words is "eighteen million, nine hundred seventy-three thousand, one hundred twenty-eight".