840997 has 4 divisors (see below), whose sum is σ = 885280. Its totient is φ = 796716.

The previous prime is 840991. The next prime is 841003. The reversal of 840997 is 799048.

It is a happy number.

840997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is an interprime number because it is at equal distance from previous prime (840991) and next prime (841003).

It is a cyclic number.

It is not a de Polignac number, because 840997 - 2³ = 840989 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 (840991) 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, 22113 + ... + 22150.

It is an arithmetic number, because the mean of its divisors is an integer number (221320).

2⁸⁴⁰⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

840997 is a deficient number, since it is larger than the sum of its proper divisors (44283).

840997 is a wasteful number, since it uses less digits than its factorization.

840997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44282.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 840997 is about 917.0588857865. The cubic root of 840997 is about 94.3911945368.

The spelling of 840997 in words is "eight hundred forty thousand, nine hundred ninety-seven".