18858147840 has 960 divisors, whose sum is σ = 81359081100. Its totient is φ = 4161798144.

The previous prime is 18858147839. The next prime is 18858147851. The reversal of 18858147840 is 4874185881.

18858147840 is a `hidden beast` number, since 1 + 88 + 58 + 1 + 478 + 40 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18793119744 + 65028096 = 137088^2 + 8064^2 .

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 (54).

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 650280946 + ... + 650280974.

Almost surely, 2^18858147840 is an apocalyptic number.

18858147840 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 18858147840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40679540550).

18858147840 is an abundant number, since it is smaller than the sum of its proper divisors (62500933260).

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

18858147840 is an frugal number, since it uses more digits than its factorization.

18858147840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 46 counting only the distinct ones).

The product of its (nonzero) digits is 2293760, while the sum is 54.

The spelling of 18858147840 in words is "eighteen billion, eight hundred fifty-eight million, one hundred forty-seven thousand, eight hundred forty".