18005597 has 6 divisors (see below), whose sum is σ = 19003518. Its totient is φ = 17057592.

The previous prime is 18005593. The next prime is 18005621. The reversal of 18005597 is 79550081.

It can be written as a sum of positive squares in only one way, i.e., 10310521 + 7695076 = 3211^2 + 2774^2 .

It is not a de Polignac number, because 18005597 - 2² = 18005593 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 (18005591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24578 + ... + 25299.

It is an arithmetic number, because the mean of its divisors is an integer number (3167253).

Almost surely, 2^18005597 is an apocalyptic number.

It is an amenable number.

18005597 is a deficient number, since it is larger than the sum of its proper divisors (997921).

18005597 is an equidigital number, since it uses as much as digits as its factorization.

18005597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49915 (or 49896 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 35.

The square root of 18005597 is about 4243.3002486272. The cubic root of 18005597 is about 262.1013001052.

The spelling of 18005597 in words is "eighteen million, five thousand, five hundred ninety-seven".