18073817 has 4 divisors (see below), whose sum is σ = 18082356. Its totient is φ = 18065280.

The previous prime is 18073813. The next prime is 18073819. The reversal of 18073817 is 71837081.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6370576 + 11703241 = 2524^2 + 3421^2 .

It is a cyclic number.

It is not a de Polignac number, because 18073817 - 2² = 18073813 is a prime.

It is a super-4 number, since 4×18073817⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18073813) 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, 1553 + ... + 6209.

It is an arithmetic number, because the mean of its divisors is an integer number (4520589).

It is a Poulet number, since it divides 2^18073816-1.

Almost surely, 2^18073817 is an apocalyptic number.

It is an amenable number.

18073817 is a deficient number, since it is larger than the sum of its proper divisors (8539).

18073817 is an equidigital number, since it uses as much as digits as its factorization.

18073817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8538.

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 18073817 is about 4251.3312032821. The cubic root of 18073817 is about 262.4319013072.

The spelling of 18073817 in words is "eighteen million, seventy-three thousand, eight hundred seventeen".