18999213884 has 24 divisors (see below), whose sum is σ = 38197383168. Its totient is φ = 8099886960.

The previous prime is 18999213881. The next prime is 18999213899. The reversal of 18999213884 is 48831299981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18999213881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1770944 + ... + 1781639.

It is an arithmetic number, because the mean of its divisors is an integer number (1591557632).

Almost surely, 2^18999213884 is an apocalyptic number.

18999213884 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18999213884 is an abundant number, since it is smaller than the sum of its proper divisors (19198169284).

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

18999213884 is a wasteful number, since it uses less digits than its factorization.

18999213884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3552785 (or 3552783 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 62.

The spelling of 18999213884 in words is "eighteen billion, nine hundred ninety-nine million, two hundred thirteen thousand, eight hundred eighty-four".