18875385 has 24 divisors (see below), whose sum is σ = 33049224. Its totient is φ = 9964800.

The previous prime is 18875377. The next prime is 18875393. The reversal of 18875385 is 58357881.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18875377) and next prime (18875393).

It can be written as a sum of positive squares in 4 ways, for example, as 1411344 + 17464041 = 1188^2 + 4179^2 .

It is not a de Polignac number, because 18875385 - 2³ = 18875377 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18875385.

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, 2469 + ... + 6621.

It is an arithmetic number, because the mean of its divisors is an integer number (1377051).

Almost surely, 2^18875385 is an apocalyptic number.

18875385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18875385 is a deficient number, since it is larger than the sum of its proper divisors (14173839).

18875385 is a wasteful number, since it uses less digits than its factorization.

18875385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4265 (or 4262 counting only the distinct ones).

The product of its digits is 268800, while the sum is 45.

The square root of 18875385 is about 4344.5811075407. The cubic root of 18875385 is about 266.2555113585.

The spelling of 18875385 in words is "eighteen million, eight hundred seventy-five thousand, three hundred eighty-five".