18323871840 has 576 divisors, whose sum is σ = 69953974272. Its totient is φ = 4516300800.

The previous prime is 18323871799. The next prime is 18323871847. The reversal of 18323871840 is 4817832381.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18323871847) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 27721110 + ... + 27721770.

It is an arithmetic number, because the mean of its divisors is an integer number (121447872).

Almost surely, 2^18323871840 is an apocalyptic number.

18323871840 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 18323871840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34976987136).

18323871840 is an abundant number, since it is smaller than the sum of its proper divisors (51630102432).

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

18323871840 is a wasteful number, since it uses less digits than its factorization.

18323871840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745 (or 725 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 18323871840 in words is "eighteen billion, three hundred twenty-three million, eight hundred seventy-one thousand, eight hundred forty".