18919091892 has 24 divisors (see below), whose sum is σ = 44148506976. Its totient is φ = 6305798368.

The previous prime is 18919091887. The next prime is 18919091911. The reversal of 18919091892 is 29819091981.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81838 + ... + 211034.

It is an arithmetic number, because the mean of its divisors is an integer number (1839521124).

Almost surely, 2^18919091892 is an apocalyptic number.

18919091892 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18919091892 is an abundant number, since it is smaller than the sum of its proper divisors (25229415084).

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

18919091892 is a wasteful number, since it uses less digits than its factorization.

18919091892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141407 (or 141405 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 57.

The spelling of 18919091892 in words is "eighteen billion, nine hundred nineteen million, ninety-one thousand, eight hundred ninety-two".