840836685 has 24 divisors (see below), whose sum is σ = 1456791264. Its totient is φ = 413949120.

The previous prime is 840836683. The next prime is 840836699. The reversal of 840836685 is 586638048.

It is not a de Polignac number, because 840836685 - 2¹ = 840836683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840836681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 163311 + ... + 168380.

It is an arithmetic number, because the mean of its divisors is an integer number (60699636).

Almost surely, 2^840836685 is an apocalyptic number.

It is an amenable number.

840836685 is a deficient number, since it is larger than the sum of its proper divisors (615954579).

840836685 is a wasteful number, since it uses less digits than its factorization.

840836685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331725 (or 331712 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 48.

The square root of 840836685 is about 28997.1840874248. The cubic root of 840836685 is about 943.8519638382.

The spelling of 840836685 in words is "eight hundred forty million, eight hundred thirty-six thousand, six hundred eighty-five".