18117697 has 8 divisors (see below), whose sum is σ = 20538560. Its totient is φ = 15843600.

The previous prime is 18117691. The next prime is 18117703. The reversal of 18117697 is 79671181.

It is an interprime number because it is at equal distance from previous prime (18117691) and next prime (18117703).

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 18117697 - 2⁷ = 18117569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18117691) 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, 36429 + ... + 36922.

It is an arithmetic number, because the mean of its divisors is an integer number (2567320).

Almost surely, 2^18117697 is an apocalyptic number.

It is an amenable number.

18117697 is a deficient number, since it is larger than the sum of its proper divisors (2420863).

18117697 is a wasteful number, since it uses less digits than its factorization.

18117697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73383.

The product of its digits is 21168, while the sum is 40.

The square root of 18117697 is about 4256.4888112152. The cubic root of 18117697 is about 262.6441089291.

The spelling of 18117697 in words is "eighteen million, one hundred seventeen thousand, six hundred ninety-seven".