840442671 has 6 divisors (see below), whose sum is σ = 1213972760. Its totient is φ = 560295108.

The previous prime is 840442661. The next prime is 840442699. The reversal of 840442671 is 176244048.

It is not a de Polignac number, because 840442671 - 2⁵ = 840442639 is a prime.

It is a super-2 number, since 2×840442671² = 1412687766475228482, 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 (840442601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46691251 + ... + 46691268.

Almost surely, 2^840442671 is an apocalyptic number.

840442671 is a deficient number, since it is larger than the sum of its proper divisors (373530089).

840442671 is a wasteful number, since it uses less digits than its factorization.

840442671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93382525 (or 93382522 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 840442671 is about 28990.3892867964. The cubic root of 840442671 is about 943.7045119020.

The spelling of 840442671 in words is "eight hundred forty million, four hundred forty-two thousand, six hundred seventy-one".