18336397 has 4 divisors (see below), whose sum is σ = 18498780. Its totient is φ = 18174016.

The previous prime is 18336391. The next prime is 18336467. The reversal of 18336397 is 79363381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79363381 = 467 ⋅169943.

It can be written as a sum of positive squares in 2 ways, for example, as 872356 + 17464041 = 934^2 + 4179^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18336397 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 (18336391) 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 3 ways as a sum of consecutive naturals, for example, 81022 + ... + 81247.

It is an arithmetic number, because the mean of its divisors is an integer number (4624695).

Almost surely, 2^18336397 is an apocalyptic number.

It is an amenable number.

18336397 is a deficient number, since it is larger than the sum of its proper divisors (162383).

18336397 is a wasteful number, since it uses less digits than its factorization.

18336397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162382.

The product of its digits is 81648, while the sum is 40.

The square root of 18336397 is about 4282.1019371332. The cubic root of 18336397 is about 263.6966835170.

The spelling of 18336397 in words is "eighteen million, three hundred thirty-six thousand, three hundred ninety-seven".