865006405 has 4 divisors (see below), whose sum is σ = 1038007692. Its totient is φ = 692005120.

The previous prime is 865006399. The next prime is 865006411. The reversal of 865006405 is 504600568.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (865006399) and next prime (865006411).

It can be written as a sum of positive squares in 2 ways, for example, as 206468161 + 658538244 = 14369^2 + 25662^2 .

It is not a de Polignac number, because 865006405 - 2²¹ = 862909253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86500636 + ... + 86500645.

It is an arithmetic number, because the mean of its divisors is an integer number (259501923).

Almost surely, 2^865006405 is an apocalyptic number.

It is an amenable number.

865006405 is a deficient number, since it is larger than the sum of its proper divisors (173001287).

865006405 is a wasteful number, since it uses less digits than its factorization.

865006405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173001286.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 865006405 is about 29410.9912277706. The cubic root of 865006405 is about 952.8102951771.

The spelling of 865006405 in words is "eight hundred sixty-five million, six thousand, four hundred five".