18375840 has 144 divisors (see below), whose sum is σ = 71705088. Its totient is φ = 4197888.

The previous prime is 18375809. The next prime is 18375857. The reversal of 18375840 is 4857381.

It is a tau number, because it is divible by the number of its divisors (144).

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 = 18375795 and 18375804.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9169 + ... + 10991.

It is an arithmetic number, because the mean of its divisors is an integer number (497952).

Almost surely, 2^18375840 is an apocalyptic number.

18375840 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 18375840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35852544).

18375840 is an abundant number, since it is smaller than the sum of its proper divisors (53329248).

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

18375840 is a wasteful number, since it uses less digits than its factorization.

18375840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851 (or 1840 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 18375840 is about 4286.7050283405. The cubic root of 18375840 is about 263.8856253870.

The spelling of 18375840 in words is "eighteen million, three hundred seventy-five thousand, eight hundred forty".