18845857440 has 192 divisors, whose sum is σ = 66240115200. Its totient is φ = 5004260352.

The previous prime is 18845857439. The next prime is 18845857441. The reversal of 18845857440 is 4475854881.

18845857440 is a `hidden beast` number, since 1 + 88 + 45 + 85 + 7 + 440 = 666.

It is an interprime number because it is at equal distance from previous prime (18845857439) and next prime (18845857441).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (18845857441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1023354 + ... + 1041606.

It is an arithmetic number, because the mean of its divisors is an integer number (345000600).

Almost surely, 2^18845857440 is an apocalyptic number.

18845857440 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 18845857440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33120057600).

18845857440 is an abundant number, since it is smaller than the sum of its proper divisors (47394257760).

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

18845857440 is a wasteful number, since it uses less digits than its factorization.

18845857440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18516 (or 18502 counting only the distinct ones).

The product of its (nonzero) digits is 5734400, while the sum is 54.

The spelling of 18845857440 in words is "eighteen billion, eight hundred forty-five million, eight hundred fifty-seven thousand, four hundred forty".