842172223 has 4 divisors (see below), whose sum is σ = 842267520. Its totient is φ = 842076928.

The previous prime is 842172217. The next prime is 842172269. The reversal of 842172223 is 322271248.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-842172223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842172293) 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, 32863 + ... + 52576.

It is an arithmetic number, because the mean of its divisors is an integer number (210566880).

Almost surely, 2^842172223 is an apocalyptic number.

842172223 is a deficient number, since it is larger than the sum of its proper divisors (95297).

842172223 is an equidigital number, since it uses as much as digits as its factorization.

842172223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95296.

The product of its digits is 10752, while the sum is 31.

The square root of 842172223 is about 29020.2037036269. The cubic root of 842172223 is about 944.3514200660.

The spelling of 842172223 in words is "eight hundred forty-two million, one hundred seventy-two thousand, two hundred twenty-three".