18871875 has 72 divisors (see below), whose sum is σ = 37778832. Its totient is φ = 9000000.

The previous prime is 18871873. The next prime is 18871889. The reversal of 18871875 is 57817881.

It is not a de Polignac number, because 18871875 - 2¹ = 18871873 is a prime.

It is a super-2 number, since 2×18871875² = 712295332031250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

Its product of digits (125440) is a multiple of the sum of its prime divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 18871875.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18871873) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 309345 + ... + 309405.

It is an arithmetic number, because the mean of its divisors is an integer number (524706).

Almost surely, 2^18871875 is an apocalyptic number.

18871875 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18871875 is an abundant number, since it is smaller than the sum of its proper divisors (18906957).

18871875 is an equidigital number, since it uses as much as digits as its factorization.

18871875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103 (or 80 counting only the distinct ones).

The product of its digits is 125440, while the sum is 45.

The square root of 18871875 is about 4344.1771372724. The cubic root of 18871875 is about 266.2390063569.

The spelling of 18871875 in words is "eighteen million, eight hundred seventy-one thousand, eight hundred seventy-five".