18115373 has 4 divisors (see below), whose sum is σ = 18247740. Its totient is φ = 17983008.

The previous prime is 18115367. The next prime is 18115381. The reversal of 18115373 is 37351181.

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 6568969 + 11546404 = 2563^2 + 3398^2 .

It is a cyclic number.

It is not a de Polignac number, because 18115373 - 2⁶ = 18115309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18115313) 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, 65978 + ... + 66251.

It is an arithmetic number, because the mean of its divisors is an integer number (4561935).

Almost surely, 2^18115373 is an apocalyptic number.

It is an amenable number.

18115373 is a deficient number, since it is larger than the sum of its proper divisors (132367).

18115373 is a wasteful number, since it uses less digits than its factorization.

18115373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132366.

The product of its digits is 2520, while the sum is 29.

The square root of 18115373 is about 4256.2158074985. The cubic root of 18115373 is about 262.6328784545.

The spelling of 18115373 in words is "eighteen million, one hundred fifteen thousand, three hundred seventy-three".