840879865 has 32 divisors (see below), whose sum is σ = 1243549440. Its totient is φ = 532915200.

The previous prime is 840879863. The next prime is 840879883. The reversal of 840879865 is 568978048.

It is not a de Polignac number, because 840879865 - 2¹ = 840879863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (840879863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11845 + ... + 42685.

It is an arithmetic number, because the mean of its divisors is an integer number (38860920).

Almost surely, 2^840879865 is an apocalyptic number.

It is an amenable number.

840879865 is a deficient number, since it is larger than the sum of its proper divisors (402669575).

840879865 is a wasteful number, since it uses less digits than its factorization.

840879865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30913.

The product of its (nonzero) digits is 3870720, while the sum is 55.

The square root of 840879865 is about 28997.9286329214. The cubic root of 840879865 is about 943.8681202972.

The spelling of 840879865 in words is "eight hundred forty million, eight hundred seventy-nine thousand, eight hundred sixty-five".