18250865 has 4 divisors (see below), whose sum is σ = 21901044. Its totient is φ = 14600688.

The previous prime is 18250823. The next prime is 18250901. The reversal of 18250865 is 56805281.

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 5513104 + 12737761 = 2348^2 + 3569^2 .

It is a cyclic number.

It is not a de Polignac number, because 18250865 - 2¹⁰ = 18249841 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1825082 + ... + 1825091.

It is an arithmetic number, because the mean of its divisors is an integer number (5475261).

Almost surely, 2^18250865 is an apocalyptic number.

It is an amenable number.

18250865 is a deficient number, since it is larger than the sum of its proper divisors (3650179).

18250865 is an equidigital number, since it uses as much as digits as its factorization.

18250865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3650178.

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 18250865 is about 4272.1031120515. The cubic root of 18250865 is about 263.2860309560.

The spelling of 18250865 in words is "eighteen million, two hundred fifty thousand, eight hundred sixty-five".