18235997 has 8 divisors (see below), whose sum is σ = 19676160. Its totient is φ = 16801200.

The previous prime is 18235981. The next prime is 18236017. The reversal of 18235997 is 79953281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18235997 - 2⁴ = 18235981 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 (18235907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8372 + ... + 10322.

It is an arithmetic number, because the mean of its divisors is an integer number (2459520).

Almost surely, 2^18235997 is an apocalyptic number.

It is an amenable number.

18235997 is a deficient number, since it is larger than the sum of its proper divisors (1440163).

18235997 is a wasteful number, since it uses less digits than its factorization.

18235997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683.

The product of its digits is 136080, while the sum is 44.

The square root of 18235997 is about 4270.3626309718. The cubic root of 18235997 is about 263.2145165341.

The spelling of 18235997 in words is "eighteen million, two hundred thirty-five thousand, nine hundred ninety-seven".