18115273 has 6 divisors (see below), whose sum is σ = 19911962. Its totient is φ = 16468320.

The previous prime is 18115261. The next prime is 18115277. The reversal of 18115273 is 37251181.

It can be written as a sum of positive squares in only one way, i.e., 10673289 + 7441984 = 3267^2 + 2728^2 .

It is not a de Polignac number, because 18115273 - 2¹³ = 18107081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18115277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74736 + ... + 74977.

Almost surely, 2^18115273 is an apocalyptic number.

It is an amenable number.

18115273 is a deficient number, since it is larger than the sum of its proper divisors (1796689).

18115273 is a wasteful number, since it uses less digits than its factorization.

18115273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149735 (or 149724 counting only the distinct ones).

The product of its digits is 1680, while the sum is 28.

The square root of 18115273 is about 4256.2040599577. The cubic root of 18115273 is about 262.6323951939.

The spelling of 18115273 in words is "eighteen million, one hundred fifteen thousand, two hundred seventy-three".