840886605 has 96 divisors (see below), whose sum is σ = 1644735456. Its totient is φ = 394647552.

The previous prime is 840886573. The next prime is 840886621. The reversal of 840886605 is 506688048.

It can be written as a sum of positive squares in 16 ways, for example, as 2601 + 840884004 = 51^2 + 28998^2 .

It is not a de Polignac number, because 840886605 - 2⁵ = 840886573 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1146819 + ... + 1147551.

It is an arithmetic number, because the mean of its divisors is an integer number (17132661).

Almost surely, 2^840886605 is an apocalyptic number.

It is an amenable number.

840886605 is a deficient number, since it is larger than the sum of its proper divisors (803848851).

840886605 is a wasteful number, since it uses less digits than its factorization.

840886605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847 (or 844 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The square root of 840886605 is about 28998.0448478859. The cubic root of 840886605 is about 943.8706421216.

The spelling of 840886605 in words is "eight hundred forty million, eight hundred eighty-six thousand, six hundred five".