18031413440 has 56 divisors (see below), whose sum is σ = 45197176560. Its totient is φ = 6832954368.

The previous prime is 18031413437. The next prime is 18031413527. The reversal of 18031413440 is 4431413081.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1476767 + ... + 1488926.

Almost surely, 2^18031413440 is an apocalyptic number.

18031413440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18031413440 is an abundant number, since it is smaller than the sum of its proper divisors (27165763120).

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

18031413440 is a wasteful number, since it uses less digits than its factorization.

18031413440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2965729 (or 2965719 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 18031413440 in words is "eighteen billion, thirty-one million, four hundred thirteen thousand, four hundred forty".