17997967 has 8 divisors (see below), whose sum is σ = 19461456. Its totient is φ = 16545792.

The previous prime is 17997953. The next prime is 17997977. The reversal of 17997967 is 76979971.

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 17997967 - 2⁷ = 17997839 is a prime.

It is a super-2 number, since 2×17997967² = 647853632266178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17997907) 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, 648 + ... + 6034.

It is an arithmetic number, because the mean of its divisors is an integer number (2432682).

Almost surely, 2^17997967 is an apocalyptic number.

17997967 is a deficient number, since it is larger than the sum of its proper divisors (1463489).

17997967 is a wasteful number, since it uses less digits than its factorization.

17997967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5657.

The product of its digits is 1500282, while the sum is 55.

The square root of 17997967 is about 4242.4010890061. The cubic root of 17997967 is about 262.0642724434.

The spelling of 17997967 in words is "seventeen million, nine hundred ninety-seven thousand, nine hundred sixty-seven".