18856036440 has 256 divisors, whose sum is σ = 65488896000. Its totient is φ = 4820497920.

The previous prime is 18856036439. The next prime is 18856036453. The reversal of 18856036440 is 4463065881.

18856036440 is a `hidden beast` number, since 1 + 88 + 560 + 3 + 6 + 4 + 4 + 0 = 666.

It is a super-2 number, since 2×18856036440² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3646737 + ... + 3651903.

It is an arithmetic number, because the mean of its divisors is an integer number (255816000).

Almost surely, 2^18856036440 is an apocalyptic number.

18856036440 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 18856036440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32744448000).

18856036440 is an abundant number, since it is smaller than the sum of its proper divisors (46632859560).

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

18856036440 is a wasteful number, since it uses less digits than its factorization.

18856036440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5327 (or 5317 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 18856036440 in words is "eighteen billion, eight hundred fifty-six million, thirty-six thousand, four hundred forty".