18745865 has 16 divisors (see below), whose sum is σ = 23343552. Its totient is φ = 14439744.

The previous prime is 18745843. The next prime is 18745871. The reversal of 18745865 is 56854781.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18745865 - 2⁶ = 18745801 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19322 + ... + 20268.

It is an arithmetic number, because the mean of its divisors is an integer number (1458972).

Almost surely, 2^18745865 is an apocalyptic number.

It is an amenable number.

18745865 is a deficient number, since it is larger than the sum of its proper divisors (4597687).

18745865 is a wasteful number, since it uses less digits than its factorization.

18745865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096.

The product of its digits is 268800, while the sum is 44.

The square root of 18745865 is about 4329.6495239222. The cubic root of 18745865 is about 265.6451115568.

The spelling of 18745865 in words is "eighteen million, seven hundred forty-five thousand, eight hundred sixty-five".