18117966 has 8 divisors (see below), whose sum is σ = 36235944. Its totient is φ = 6039320.

The previous prime is 18117959. The next prime is 18117973. The reversal of 18117966 is 66971181.

It is an interprime number because it is at equal distance from previous prime (18117959) and next prime (18117973).

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

18117966 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1509825 + ... + 1509836.

It is an arithmetic number, because the mean of its divisors is an integer number (4529493).

Almost surely, 2^18117966 is an apocalyptic number.

18117966 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18117966 is a wasteful number, since it uses less digits than its factorization.

18117966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3019666.

The product of its digits is 18144, while the sum is 39.

The square root of 18117966 is about 4256.5204099123. The cubic root of 18117966 is about 262.6454087801.

The spelling of 18117966 in words is "eighteen million, one hundred seventeen thousand, nine hundred sixty-six".