840425 has 6 divisors (see below), whose sum is σ = 1042158. Its totient is φ = 672320.

The previous prime is 840353. The next prime is 840439. The reversal of 840425 is 524048.

It can be written as a sum of positive squares in 3 ways, for example, as 1369 + 839056 = 37^2 + 916^2 .

It is a de Polignac number, because none of the positive numbers 2^k-840425 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 840425.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840425.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16784 + ... + 16833.

It is an arithmetic number, because the mean of its divisors is an integer number (173693).

2⁸⁴⁰⁴²⁵ is an apocalyptic number.

It is an amenable number.

840425 is a deficient number, since it is larger than the sum of its proper divisors (201733).

840425 is a wasteful number, since it uses less digits than its factorization.

840425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33627 (or 33622 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 840425 is about 916.7469661799. The cubic root of 840425 is about 94.3697897800.

The spelling of 840425 in words is "eight hundred forty thousand, four hundred twenty-five".