18265873 has 2 divisors, whose sum is σ = 18265874. Its totient is φ = 18265872.

The previous prime is 18265861. The next prime is 18265879. The reversal of 18265873 is 37856281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16096144 + 2169729 = 4012^2 + 1473^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18265873 is a prime.

It is not a weakly prime, because it can be changed into another prime (18265879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9132936 + 9132937.

It is an arithmetic number, because the mean of its divisors is an integer number (9132937).

Almost surely, 2^18265873 is an apocalyptic number.

It is an amenable number.

18265873 is a deficient number, since it is larger than the sum of its proper divisors (1).

18265873 is an equidigital number, since it uses as much as digits as its factorization.

18265873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 40.

The square root of 18265873 is about 4273.8592630081. The cubic root of 18265873 is about 263.3581793929.

The spelling of 18265873 in words is "eighteen million, two hundred sixty-five thousand, eight hundred seventy-three".