18212909990 has 32 divisors (see below), whose sum is σ = 37645827840. Its totient is φ = 6274303200.

The previous prime is 18212909987. The next prime is 18212910011. The reversal of 18212909990 is 9990921281.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4355066 + ... + 4359245.

It is an arithmetic number, because the mean of its divisors is an integer number (1176432120).

Almost surely, 2^18212909990 is an apocalyptic number.

18212909990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18212909990 is an abundant number, since it is smaller than the sum of its proper divisors (19432917850).

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

18212909990 is a wasteful number, since it uses less digits than its factorization.

18212909990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8714348.

The product of its (nonzero) digits is 209952, while the sum is 50.

The spelling of 18212909990 in words is "eighteen billion, two hundred twelve million, nine hundred nine thousand, nine hundred ninety".