18816731384 has 32 divisors (see below), whose sum is σ = 40752817200. Its totient is φ = 8049937920.

The previous prime is 18816731369. The next prime is 18816731387. The reversal of 18816731384 is 48313761881.

It is a super-2 number, since 2×18816731384² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18816731387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6287519 + ... + 6290510.

Almost surely, 2^18816731384 is an apocalyptic number.

It is an amenable number.

18816731384 is an abundant number, since it is smaller than the sum of its proper divisors (21936085816).

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

18816731384 is a wasteful number, since it uses less digits than its factorization.

18816731384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12578063 (or 12578059 counting only the distinct ones).

The product of its digits is 774144, while the sum is 50.

The spelling of 18816731384 in words is "eighteen billion, eight hundred sixteen million, seven hundred thirty-one thousand, three hundred eighty-four".