18415875420 has 96 divisors (see below), whose sum is σ = 57512125440. Its totient is φ = 4892189760.

The previous prime is 18415875383. The next prime is 18415875449. The reversal of 18415875420 is 2457851481.

18415875420 is a `hidden beast` number, since 1 + 8 + 4 + 158 + 75 + 420 = 666.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77185 + ... + 206855.

It is an arithmetic number, because the mean of its divisors is an integer number (599084640).

Almost surely, 2^18415875420 is an apocalyptic number.

18415875420 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 18415875420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28756062720).

18415875420 is an abundant number, since it is smaller than the sum of its proper divisors (39096250020).

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

18415875420 is a wasteful number, since it uses less digits than its factorization.

18415875420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129952 (or 129944 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 45.

The spelling of 18415875420 in words is "eighteen billion, four hundred fifteen million, eight hundred seventy-five thousand, four hundred twenty".