18391920092 has 36 divisors (see below), whose sum is σ = 40320753480. Its totient is φ = 7275923424.

The previous prime is 18391920073. The next prime is 18391920109. The reversal of 18391920092 is 29002919381.

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 11 ways as a sum of consecutive naturals, for example, 3606542 + ... + 3611637.

It is an arithmetic number, because the mean of its divisors is an integer number (1120020930).

Almost surely, 2^18391920092 is an apocalyptic number.

It is an amenable number.

18391920092 is an abundant number, since it is smaller than the sum of its proper divisors (21928833388).

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

18391920092 is a wasteful number, since it uses less digits than its factorization.

18391920092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7218210 (or 7218201 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 44.

The spelling of 18391920092 in words is "eighteen billion, three hundred ninety-one million, nine hundred twenty thousand, ninety-two".