18089773 has 4 divisors (see below), whose sum is σ = 19481308. Its totient is φ = 16698240.

The previous prime is 18089737. The next prime is 18089789. The reversal of 18089773 is 37798081.

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 2550409 + 15539364 = 1597^2 + 3942^2 .

It is not a de Polignac number, because 18089773 - 2⁹ = 18089261 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 (18089723) 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, 695748 + ... + 695773.

It is an arithmetic number, because the mean of its divisors is an integer number (4870327).

Almost surely, 2^18089773 is an apocalyptic number.

18089773 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18089773 is a deficient number, since it is larger than the sum of its proper divisors (1391535).

18089773 is a wasteful number, since it uses less digits than its factorization.

18089773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391534.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 18089773 is about 4253.2073779678. The cubic root of 18089773 is about 262.5091056554.

The spelling of 18089773 in words is "eighteen million, eighty-nine thousand, seven hundred seventy-three".