840843097 has 4 divisors (see below), whose sum is σ = 840912640. Its totient is φ = 840773556.

The previous prime is 840843089. The next prime is 840843121. The reversal of 840843097 is 790348048.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 840843097 - 2³ = 840843089 is a prime.

It is a super-2 number, since 2×840843097² = 1414034227545102818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840843077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11397 + ... + 42562.

It is an arithmetic number, because the mean of its divisors is an integer number (210228160).

Almost surely, 2^840843097 is an apocalyptic number.

It is an amenable number.

840843097 is a deficient number, since it is larger than the sum of its proper divisors (69543).

840843097 is a wasteful number, since it uses less digits than its factorization.

840843097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69542.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 840843097 is about 28997.2946496738. The cubic root of 840843097 is about 943.8543630213.

The spelling of 840843097 in words is "eight hundred forty million, eight hundred forty-three thousand, ninety-seven".