18903821812 has 12 divisors (see below), whose sum is σ = 33156367776. Its totient is φ = 9430573880.

The previous prime is 18903821803. The next prime is 18903821851. The reversal of 18903821812 is 21812830981.

It is a happy number.

It is a congruent number.

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, 5332264 + ... + 5335807.

It is an arithmetic number, because the mean of its divisors is an integer number (2763030648).

Almost surely, 2^18903821812 is an apocalyptic number.

It is an amenable number.

18903821812 is a deficient number, since it is larger than the sum of its proper divisors (14252545964).

18903821812 is a wasteful number, since it uses less digits than its factorization.

18903821812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10668518 (or 10668516 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 43.

The spelling of 18903821812 in words is "eighteen billion, nine hundred three million, eight hundred twenty-one thousand, eight hundred twelve".