840437 has 6 divisors (see below), whose sum is σ = 910242. Its totient is φ = 775632.

The previous prime is 840353. The next prime is 840439. The reversal of 840437 is 734048.

It can be written as a sum of positive squares in 3 ways, for example, as 5041 + 835396 = 71^2 + 914^2 .

It is not a de Polignac number, because 840437 - 2⁸ = 840181 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 (840439) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2318 + ... + 2655.

It is an arithmetic number, because the mean of its divisors is an integer number (151707).

2⁸⁴⁰⁴³⁷ is an apocalyptic number.

It is an amenable number.

840437 is a deficient number, since it is larger than the sum of its proper divisors (69805).

840437 is a wasteful number, since it uses less digits than its factorization.

840437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4999 (or 4986 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 840437 is about 916.7535110377. The cubic root of 840437 is about 94.3702389306.

The spelling of 840437 in words is "eight hundred forty thousand, four hundred thirty-seven".