17997966 has 24 divisors (see below), whose sum is σ = 44566704. Its totient is φ = 5142240.

The previous prime is 17997953. The next prime is 17997977. The reversal of 17997966 is 66979971.

It is a nude number because it is divisible by every one of its digits.

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 11 ways as a sum of consecutive naturals, for example, 71295 + ... + 71546.

It is an arithmetic number, because the mean of its divisors is an integer number (1856946).

Almost surely, 2^17997966 is an apocalyptic number.

17997966 is an abundant number, since it is smaller than the sum of its proper divisors (26568738).

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

17997966 is a wasteful number, since it uses less digits than its factorization.

17997966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142856 (or 142853 counting only the distinct ones).

The product of its digits is 1285956, while the sum is 54.

The square root of 17997966 is about 4242.4009711483. The cubic root of 17997966 is about 262.0642675898.

The spelling of 17997966 in words is "seventeen million, nine hundred ninety-seven thousand, nine hundred sixty-six".