18474385 has 4 divisors (see below), whose sum is σ = 22169268. Its totient is φ = 14779504.

The previous prime is 18474377. The next prime is 18474439. The reversal of 18474385 is 58347481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6091024 + 12383361 = 2468^2 + 3519^2 .

It is a cyclic number.

It is not a de Polignac number, because 18474385 - 2³ = 18474377 is a prime.

It is a super-2 number, since 2×18474385² = 682605802256450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1847434 + ... + 1847443.

It is an arithmetic number, because the mean of its divisors is an integer number (5542317).

Almost surely, 2^18474385 is an apocalyptic number.

It is an amenable number.

18474385 is a deficient number, since it is larger than the sum of its proper divisors (3694883).

18474385 is an equidigital number, since it uses as much as digits as its factorization.

18474385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3694882.

The product of its digits is 107520, while the sum is 40.

The square root of 18474385 is about 4298.1839188197. The cubic root of 18474385 is about 264.3565020302.

The spelling of 18474385 in words is "eighteen million, four hundred seventy-four thousand, three hundred eighty-five".