18431143836 has 192 divisors, whose sum is σ = 52370841600. Its totient is φ = 4933442304.

The previous prime is 18431143831. The next prime is 18431143919. The reversal of 18431143836 is 63834113481.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18431143831) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18749401 + ... + 18750383.

It is an arithmetic number, because the mean of its divisors is an integer number (272764800).

Almost surely, 2^18431143836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18431143836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26185420800).

18431143836 is an abundant number, since it is smaller than the sum of its proper divisors (33939697764).

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

18431143836 is a wasteful number, since it uses less digits than its factorization.

18431143836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248 (or 1246 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The spelling of 18431143836 in words is "eighteen billion, four hundred thirty-one million, one hundred forty-three thousand, eight hundred thirty-six".