18396709440 has 224 divisors, whose sum is σ = 60464517120. Its totient is φ = 4734105600.

The previous prime is 18396709423. The next prime is 18396709447. The reversal of 18396709440 is 4490769381.

It is a super-2 number, since 2×18396709440² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18396709447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14611531 + ... + 14612789.

It is an arithmetic number, because the mean of its divisors is an integer number (269930880).

Almost surely, 2^18396709440 is an apocalyptic number.

18396709440 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 18396709440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30232258560).

18396709440 is an abundant number, since it is smaller than the sum of its proper divisors (42067807680).

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

18396709440 is a wasteful number, since it uses less digits than its factorization.

18396709440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801 (or 1791 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 51.

The spelling of 18396709440 in words is "eighteen billion, three hundred ninety-six million, seven hundred nine thousand, four hundred forty".