18387183240 has 48 divisors (see below), whose sum is σ = 59758346700. Its totient is φ = 4903248768.

The previous prime is 18387183223. The next prime is 18387183281. The reversal of 18387183240 is 4238178381.

18387183240 is a `hidden beast` number, since 18 + 387 + 18 + 3 + 240 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17820648036 + 566535204 = 133494^2 + 23802^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25537395 + ... + 25538114.

Almost surely, 2^18387183240 is an apocalyptic number.

18387183240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18387183240 is an abundant number, since it is smaller than the sum of its proper divisors (41371163460).

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

18387183240 is a wasteful number, since it uses less digits than its factorization.

18387183240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51075526 (or 51075519 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 18387183240 in words is "eighteen billion, three hundred eighty-seven million, one hundred eighty-three thousand, two hundred forty".