840838885 has 16 divisors (see below), whose sum is σ = 1042877952. Its totient is φ = 650145600.

The previous prime is 840838877. The next prime is 840838891. The reversal of 840838885 is 588838048.

It is not a de Polignac number, because 840838885 - 2³ = 840838877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137595 + ... + 143575.

It is an arithmetic number, because the mean of its divisors is an integer number (65179872).

Almost surely, 2^840838885 is an apocalyptic number.

It is an amenable number.

840838885 is a deficient number, since it is larger than the sum of its proper divisors (202039067).

840838885 is a wasteful number, since it uses less digits than its factorization.

840838885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6924.

The product of its (nonzero) digits is 1966080, while the sum is 52.

The square root of 840838885 is about 28997.2220221179. Note that the first 3 decimals coincide. The cubic root of 840838885 is about 943.8527870153.

The spelling of 840838885 in words is "eight hundred forty million, eight hundred thirty-eight thousand, eight hundred eighty-five".