18857993440 has 192 divisors, whose sum is σ = 52661327040. Its totient is φ = 6328657920.

The previous prime is 18857993437. The next prime is 18857993443. The reversal of 18857993440 is 4439975881.

It is an interprime number because it is at equal distance from previous prime (18857993437) and next prime (18857993443).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18857993443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3864282 + ... + 3869158.

It is an arithmetic number, because the mean of its divisors is an integer number (274277745).

Almost surely, 2^18857993440 is an apocalyptic number.

18857993440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18857993440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26330663520).

18857993440 is an abundant number, since it is smaller than the sum of its proper divisors (33803333600).

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

18857993440 is a wasteful number, since it uses less digits than its factorization.

18857993440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4942 (or 4908 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 58.

The spelling of 18857993440 in words is "eighteen billion, eight hundred fifty-seven million, nine hundred ninety-three thousand, four hundred forty".