18539065 has 4 divisors (see below), whose sum is σ = 22246884. Its totient is φ = 14831248.

The previous prime is 18539051. The next prime is 18539069. The reversal of 18539065 is 56093581.

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 9126441 + 9412624 = 3021^2 + 3068^2 .

It is a cyclic number.

It is not a de Polignac number, because 18539065 - 2¹⁷ = 18407993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18539069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1853902 + ... + 1853911.

It is an arithmetic number, because the mean of its divisors is an integer number (5561721).

Almost surely, 2^18539065 is an apocalyptic number.

It is an amenable number.

18539065 is a deficient number, since it is larger than the sum of its proper divisors (3707819).

18539065 is an equidigital number, since it uses as much as digits as its factorization.

18539065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3707818.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 18539065 is about 4305.7014527252. The cubic root of 18539065 is about 264.6646523487.

Adding to 18539065 its product of nonzero digits (32400), we get a triangular number (18571465 = T₆₀₉₄).

The spelling of 18539065 in words is "eighteen million, five hundred thirty-nine thousand, sixty-five".