18324397 has 16 divisors (see below), whose sum is σ = 22942080. Its totient is φ = 14248512.

The previous prime is 18324391. The next prime is 18324401. The reversal of 18324397 is 79342381.

It is a cyclic number.

It is not a de Polignac number, because 18324397 - 2³ = 18324389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18324391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3663 + ... + 7075.

It is an arithmetic number, because the mean of its divisors is an integer number (1433880).

Almost surely, 2^18324397 is an apocalyptic number.

It is an amenable number.

18324397 is a deficient number, since it is larger than the sum of its proper divisors (4617683).

18324397 is a wasteful number, since it uses less digits than its factorization.

18324397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3492.

The product of its digits is 36288, while the sum is 37.

The square root of 18324397 is about 4280.7005267830. The cubic root of 18324397 is about 263.6391467548.

It can be divided in two parts, 18324 and 397, that added together give a triangular number (18721 = T₁₉₃).

The spelling of 18324397 in words is "eighteen million, three hundred twenty-four thousand, three hundred ninety-seven".