168217923 has 4 divisors (see below), whose sum is σ = 224290568. Its totient is φ = 112145280.

The previous prime is 168217901. The next prime is 168217927. The reversal of 168217923 is 329712861.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 168217923 - 2⁵ = 168217891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168217927) 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, 28036318 + ... + 28036323.

It is an arithmetic number, because the mean of its divisors is an integer number (56072642).

Almost surely, 2^168217923 is an apocalyptic number.

168217923 is a deficient number, since it is larger than the sum of its proper divisors (56072645).

168217923 is an equidigital number, since it uses as much as digits as its factorization.

168217923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56072644.

The product of its digits is 36288, while the sum is 39.

The square root of 168217923 is about 12969.8852346503. The cubic root of 168217923 is about 552.0233167267.

The spelling of 168217923 in words is "one hundred sixty-eight million, two hundred seventeen thousand, nine hundred twenty-three".