18875840 has 56 divisors (see below), whose sum is σ = 45732192. Its totient is φ = 7418880.

The previous prime is 18875833. The next prime is 18875851. The reversal of 18875840 is 4857881.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19037 + ... + 20003.

Almost surely, 2^18875840 is an apocalyptic number.

18875840 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 18875840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22866096).

18875840 is an abundant number, since it is smaller than the sum of its proper divisors (26856352).

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

18875840 is an equidigital number, since it uses as much as digits as its factorization.

18875840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045 (or 1035 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 41.

The square root of 18875840 is about 4344.6334713069. The cubic root of 18875840 is about 266.2576507459.

The spelling of 18875840 in words is "eighteen million, eight hundred seventy-five thousand, eight hundred forty".