18145992 has 32 divisors (see below), whose sum is σ = 45773280. Its totient is φ = 5994240.

The previous prime is 18145991. The next prime is 18145997. The reversal of 18145992 is 29954181.

It is a self number, because there is not a number n which added to its sum of digits gives 18145992.

It is not an unprimeable number, because it can be changed into a prime (18145991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 634 + ... + 6057.

It is an arithmetic number, because the mean of its divisors is an integer number (1430415).

Almost surely, 2^18145992 is an apocalyptic number.

18145992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18145992 is an abundant number, since it is smaller than the sum of its proper divisors (27627288).

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

18145992 is a wasteful number, since it uses less digits than its factorization.

18145992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6813 (or 6809 counting only the distinct ones).

The product of its digits is 25920, while the sum is 39.

The square root of 18145992 is about 4259.8112634247. The cubic root of 18145992 is about 262.7807644458.

The spelling of 18145992 in words is "eighteen million, one hundred forty-five thousand, nine hundred ninety-two".