2086399865 has 16 divisors (see below), whose sum is σ = 2732607360. Its totient is φ = 1516648320.

The previous prime is 2086399859. The next prime is 2086399871. The reversal of 2086399865 is 5689936802.

It is an interprime number because it is at equal distance from previous prime (2086399859) and next prime (2086399871).

It is not a de Polignac number, because 2086399865 - 2⁴ = 2086399849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2086399865.

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, 122756 + ... + 138714.

It is an arithmetic number, because the mean of its divisors is an integer number (170787960).

Almost surely, 2^2086399865 is an apocalyptic number.

It is an amenable number.

2086399865 is a deficient number, since it is larger than the sum of its proper divisors (646207495).

2086399865 is a wasteful number, since it uses less digits than its factorization.

2086399865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18352.

The product of its (nonzero) digits is 5598720, while the sum is 56.

The square root of 2086399865 is about 45677.1262778209. The cubic root of 2086399865 is about 1277.8087233519.

The spelling of 2086399865 in words is "two billion, eighty-six million, three hundred ninety-nine thousand, eight hundred sixty-five".