840577985 has 16 divisors (see below), whose sum is σ = 1087242240. Its totient is φ = 620187840.

The previous prime is 840577919. The next prime is 840577999. The reversal of 840577985 is 589775048.

It is a de Polignac number, because none of the positive numbers 2^k-840577985 is a prime.

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 in 15 ways as a sum of consecutive naturals, for example, 78080 + ... + 88190.

It is an arithmetic number, because the mean of its divisors is an integer number (67952640).

Almost surely, 2^840577985 is an apocalyptic number.

It is an amenable number.

840577985 is a deficient number, since it is larger than the sum of its proper divisors (246664255).

840577985 is a wasteful number, since it uses less digits than its factorization.

840577985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11408.

The product of its (nonzero) digits is 2822400, while the sum is 53.

The square root of 840577985 is about 28992.7229662893. The cubic root of 840577985 is about 943.7551556814.

The spelling of 840577985 in words is "eight hundred forty million, five hundred seventy-seven thousand, nine hundred eighty-five".