18919892 has 12 divisors (see below), whose sum is σ = 34549536. Its totient is φ = 9048600.

The previous prime is 18919891. The next prime is 18919907. The reversal of 18919892 is 29891981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18919891) 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, 102734 + ... + 102917.

It is an arithmetic number, because the mean of its divisors is an integer number (2879128).

Almost surely, 2^18919892 is an apocalyptic number.

It is an amenable number.

18919892 is a deficient number, since it is larger than the sum of its proper divisors (15629644).

18919892 is a wasteful number, since it uses less digits than its factorization.

18919892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205678 (or 205676 counting only the distinct ones).

The product of its digits is 93312, while the sum is 47.

The square root of 18919892 is about 4349.7002195554. The cubic root of 18919892 is about 266.4646184784.

The spelling of 18919892 in words is "eighteen million, nine hundred nineteen thousand, eight hundred ninety-two".