18440494940 has 24 divisors (see below), whose sum is σ = 44257188192. Its totient is φ = 6322455360.

The previous prime is 18440494937. The next prime is 18440495027. The reversal of 18440494940 is 4949404481.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65858771 + ... + 65859050.

It is an arithmetic number, because the mean of its divisors is an integer number (1844049508).

Almost surely, 2^18440494940 is an apocalyptic number.

18440494940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18440494940 is an abundant number, since it is smaller than the sum of its proper divisors (25816693252).

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

18440494940 is a wasteful number, since it uses less digits than its factorization.

18440494940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131717837 (or 131717835 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 47.

The spelling of 18440494940 in words is "eighteen billion, four hundred forty million, four hundred ninety-four thousand, nine hundred forty".