18404386380 has 96 divisors (see below), whose sum is σ = 57529812480. Its totient is φ = 4884546240.

The previous prime is 18404386349. The next prime is 18404386391. The reversal of 18404386380 is 8368340481.

18404386380 is a `hidden beast` number, since 1 + 8 + 4 + 0 + 4 + 3 + 8 + 638 + 0 = 666.

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 31 ways as a sum of consecutive naturals, for example, 33177 + ... + 194703.

It is an arithmetic number, because the mean of its divisors is an integer number (599268880).

Almost surely, 2^18404386380 is an apocalyptic number.

18404386380 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 18404386380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28764906240).

18404386380 is an abundant number, since it is smaller than the sum of its proper divisors (39125426100).

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

18404386380 is a wasteful number, since it uses less digits than its factorization.

18404386380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161756 (or 161748 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The spelling of 18404386380 in words is "eighteen billion, four hundred four million, three hundred eighty-six thousand, three hundred eighty".