18360397 has 4 divisors (see below), whose sum is σ = 20029536. Its totient is φ = 16691260.

The previous prime is 18360389. The next prime is 18360427. The reversal of 18360397 is 79306381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18360397 - 2³ = 18360389 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 (18360367) 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, 834553 + ... + 834574.

It is an arithmetic number, because the mean of its divisors is an integer number (5007384).

Almost surely, 2^18360397 is an apocalyptic number.

It is an amenable number.

18360397 is a deficient number, since it is larger than the sum of its proper divisors (1669139).

18360397 is a wasteful number, since it uses less digits than its factorization.

18360397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669138.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 18360397 is about 4284.9033828081. The cubic root of 18360397 is about 263.8116817770.

The spelling of 18360397 in words is "eighteen million, three hundred sixty thousand, three hundred ninety-seven".