840497 has 12 divisors (see below), whose sum is σ = 1036260. Its totient is φ = 677376.

The previous prime is 840491. The next prime is 840523. The reversal of 840497 is 794048.

It is a happy number.

840497 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 461041 + 379456 = 679^2 + 616^2 .

It is not a de Polignac number, because 840497 - 2⁸ = 840241 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 329 + ... + 1337.

It is an arithmetic number, because the mean of its divisors is an integer number (86355).

2⁸⁴⁰⁴⁹⁷ is an apocalyptic number.

It is an amenable number.

840497 is a deficient number, since it is larger than the sum of its proper divisors (195763).

840497 is a wasteful number, since it uses less digits than its factorization.

840497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040 (or 1033 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 840497 is about 916.7862346262. The cubic root of 840497 is about 94.3724846193.

The spelling of 840497 in words is "eight hundred forty thousand, four hundred ninety-seven".