18024397 has 4 divisors (see below), whose sum is σ = 18046240. Its totient is φ = 18002556.

The previous prime is 18024389. The next prime is 18024401. The reversal of 18024397 is 79342081.

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 18024397 - 2³ = 18024389 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 (18024317) 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, 9633 + ... + 11350.

It is an arithmetic number, because the mean of its divisors is an integer number (4511560).

Almost surely, 2^18024397 is an apocalyptic number.

It is an amenable number.

18024397 is a deficient number, since it is larger than the sum of its proper divisors (21843).

18024397 is an equidigital number, since it uses as much as digits as its factorization.

18024397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21842.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 18024397 is about 4245.5149275441. The cubic root of 18024397 is about 262.1924900921.

The spelling of 18024397 in words is "eighteen million, twenty-four thousand, three hundred ninety-seven".