840698 has 4 divisors (see below), whose sum is σ = 1261050. Its totient is φ = 420348.

The previous prime is 840683. The next prime is 840703. The reversal of 840698 is 896048.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 779689 + 61009 = 883^2 + 247^2 .

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840698.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210173 + ... + 210176.

2⁸⁴⁰⁶⁹⁸ is an apocalyptic number.

840698 is a deficient number, since it is larger than the sum of its proper divisors (420352).

840698 is a wasteful number, since it uses less digits than its factorization.

840698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420351.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 840698 is about 916.8958501378. The cubic root of 840698 is about 94.3800068978.

The spelling of 840698 in words is "eight hundred forty thousand, six hundred ninety-eight".