842172679 has 2 divisors, whose sum is σ = 842172680. Its totient is φ = 842172678.

The previous prime is 842172659. The next prime is 842172689. The reversal of 842172679 is 976271248.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 842172679 - 2¹¹ = 842170631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (842172619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421086339 + 421086340.

It is an arithmetic number, because the mean of its divisors is an integer number (421086340).

Almost surely, 2^842172679 is an apocalyptic number.

842172679 is a deficient number, since it is larger than the sum of its proper divisors (1).

842172679 is an equidigital number, since it uses as much as digits as its factorization.

842172679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 46.

The square root of 842172679 is about 29020.2115602213. The cubic root of 842172679 is about 944.3515905078.

The spelling of 842172679 in words is "eight hundred forty-two million, one hundred seventy-two thousand, six hundred seventy-nine".