18240990930 has 48 divisors (see below), whose sum is σ = 48435663744. Its totient is φ = 4760768160.

The previous prime is 18240990899. The next prime is 18240990931. The reversal of 18240990930 is 3909904281.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (18240990931) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2151916 + ... + 2160375.

It is an arithmetic number, because the mean of its divisors is an integer number (1009076328).

Almost surely, 2^18240990930 is an apocalyptic number.

18240990930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18240990930 is an abundant number, since it is smaller than the sum of its proper divisors (30194672814).

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

18240990930 is a wasteful number, since it uses less digits than its factorization.

18240990930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4312351 (or 4312348 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The spelling of 18240990930 in words is "eighteen billion, two hundred forty million, nine hundred ninety thousand, nine hundred thirty".