18413821440 has 960 divisors, whose sum is σ = 78440693760. Its totient is φ = 3901685760.

The previous prime is 18413821427. The next prime is 18413821483. The reversal of 18413821440 is 4412831481.

It is a happy number.

18413821440 is a `hidden beast` number, since 1 + 84 + 138 + 2 + 1 + 440 = 666.

It is a tau number, because it is divible by the number of its divisors (960).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18413821395 and 18413821404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 144990657 + ... + 144990783.

It is an arithmetic number, because the mean of its divisors is an integer number (81709056).

Almost surely, 2^18413821440 is an apocalyptic number.

18413821440 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 18413821440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39220346880).

18413821440 is an abundant number, since it is smaller than the sum of its proper divisors (60026872320).

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

18413821440 is a wasteful number, since it uses less digits than its factorization.

18413821440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The spelling of 18413821440 in words is "eighteen billion, four hundred thirteen million, eight hundred twenty-one thousand, four hundred forty".