18432997 has 8 divisors (see below), whose sum is σ = 20297952. Its totient is φ = 16599600.

The previous prime is 18432989. The next prime is 18433013. The reversal of 18432997 is 79923481.

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

It is a cyclic number.

It is not a de Polignac number, because 18432997 - 2³ = 18432989 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 (18432917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6654 + ... + 9007.

It is an arithmetic number, because the mean of its divisors is an integer number (2537244).

Almost surely, 2^18432997 is an apocalyptic number.

It is an amenable number.

18432997 is a deficient number, since it is larger than the sum of its proper divisors (1864955).

18432997 is a wasteful number, since it uses less digits than its factorization.

18432997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15779.

The product of its digits is 108864, while the sum is 43.

The square root of 18432997 is about 4293.3666277177. The cubic root of 18432997 is about 264.1589425882.

The spelling of 18432997 in words is "eighteen million, four hundred thirty-two thousand, nine hundred ninety-seven".