18857499440 has 80 divisors (see below), whose sum is σ = 49269221568. Its totient is φ = 6660031488.

The previous prime is 18857499433. The next prime is 18857499523. The reversal of 18857499440 is 4499475881.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 18857499440.

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, 370259 + ... + 418098.

Almost surely, 2^18857499440 is an apocalyptic number.

18857499440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18857499440 is an abundant number, since it is smaller than the sum of its proper divisors (30411722128).

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

18857499440 is a wasteful number, since it uses less digits than its factorization.

18857499440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788406 (or 788400 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 59.

The spelling of 18857499440 in words is "eighteen billion, eight hundred fifty-seven million, four hundred ninety-nine thousand, four hundred forty".