18243959320 has 32 divisors (see below), whose sum is σ = 41324418000. Its totient is φ = 7248604288.

The previous prime is 18243959317. The next prime is 18243959339. The reversal of 18243959320 is 2395934281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1524574 + ... + 1536493.

Almost surely, 2^18243959320 is an apocalyptic number.

18243959320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18243959320 is an abundant number, since it is smaller than the sum of its proper divisors (23080458680).

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

18243959320 is a wasteful number, since it uses less digits than its factorization.

18243959320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3061227 (or 3061223 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 18243959320 in words is "eighteen billion, two hundred forty-three million, nine hundred fifty-nine thousand, three hundred twenty".