18624985 has 4 divisors (see below), whose sum is σ = 22349988. Its totient is φ = 14899984.

The previous prime is 18624973. The next prime is 18625003. The reversal of 18624985 is 58942681.

It is a happy number.

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 13191424 + 5433561 = 3632^2 + 2331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18624985 is a prime.

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, 1862494 + ... + 1862503.

It is an arithmetic number, because the mean of its divisors is an integer number (5587497).

Almost surely, 2^18624985 is an apocalyptic number.

It is an amenable number.

18624985 is a deficient number, since it is larger than the sum of its proper divisors (3725003).

18624985 is an equidigital number, since it uses as much as digits as its factorization.

18624985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3725002.

The product of its digits is 138240, while the sum is 43.

The square root of 18624985 is about 4315.6673875543. The cubic root of 18624985 is about 265.0728884585.

The spelling of 18624985 in words is "eighteen million, six hundred twenty-four thousand, nine hundred eighty-five".