17997923 has 4 divisors (see below), whose sum is σ = 18064608. Its totient is φ = 17931240.

The previous prime is 17997919. The next prime is 17997929. The reversal of 17997923 is 32979971.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32979971 = 283 ⋅116537.

It is a cyclic number.

It is not a de Polignac number, because 17997923 - 2² = 17997919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17997929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32936 + ... + 33477.

It is an arithmetic number, because the mean of its divisors is an integer number (4516152).

Almost surely, 2^17997923 is an apocalyptic number.

17997923 is a deficient number, since it is larger than the sum of its proper divisors (66685).

17997923 is an equidigital number, since it uses as much as digits as its factorization.

17997923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66684.

The product of its digits is 214326, while the sum is 47.

The square root of 17997923 is about 4242.3959032603. The cubic root of 17997923 is about 262.0640588852.

The spelling of 17997923 in words is "seventeen million, nine hundred ninety-seven thousand, nine hundred twenty-three".