18017397 has 10 divisors (see below), whose sum is σ = 26914998. Its totient is φ = 12011544.

The previous prime is 18017383. The next prime is 18017413. The reversal of 18017397 is 79371081.

It can be written as a sum of positive squares in only one way, i.e., 12068676 + 5948721 = 3474^2 + 2439^2 .

It is not a de Polignac number, because 18017397 - 2⁶ = 18017333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18017897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 111138 + ... + 111299.

Almost surely, 2^18017397 is an apocalyptic number.

It is an amenable number.

18017397 is a deficient number, since it is larger than the sum of its proper divisors (8897601).

18017397 is an equidigital number, since it uses as much as digits as its factorization.

18017397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222449 (or 222440 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 18017397 is about 4244.6904480775. The cubic root of 18017397 is about 262.1585437864.

The spelling of 18017397 in words is "eighteen million, seventeen thousand, three hundred ninety-seven".