18856454400 has 1296 divisors, whose sum is σ = 85815132480. Its totient is φ = 4025548800.

The previous prime is 18856454399. The next prime is 18856454401. The reversal of 18856454400 is 445465881.

It is a happy number.

18856454400 is a `hidden beast` number, since 1 + 88 + 564 + 5 + 4 + 4 + 0 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (18856454399) and next prime (18856454401).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18856454401) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 143942335 + ... + 143942465.

It is an arithmetic number, because the mean of its divisors is an integer number (66215380).

Almost surely, 2^18856454400 is an apocalyptic number.

18856454400 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 18856454400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42907566240).

18856454400 is an abundant number, since it is smaller than the sum of its proper divisors (66958678080).

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

18856454400 is a wasteful number, since it uses less digits than its factorization.

18856454400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 45.

The spelling of 18856454400 in words is "eighteen billion, eight hundred fifty-six million, four hundred fifty-four thousand, four hundred".