18909392040 has 1152 divisors, whose sum is σ = 86046105600. Its totient is φ = 3544611840.

The previous prime is 18909392039. The next prime is 18909392041. The reversal of 18909392040 is 4029390981.

It is an interprime number because it is at equal distance from previous prime (18909392039) and next prime (18909392041).

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 (18909392041) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 84795369 + ... + 84795591.

It is an arithmetic number, because the mean of its divisors is an integer number (74692800).

Almost surely, 2^18909392040 is an apocalyptic number.

18909392040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18909392040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43023052800).

18909392040 is an abundant number, since it is smaller than the sum of its proper divisors (67136713560).

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

18909392040 is a wasteful number, since it uses less digits than its factorization.

18909392040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 293 counting only the distinct ones).

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

The spelling of 18909392040 in words is "eighteen billion, nine hundred nine million, three hundred ninety-two thousand, forty".