865797421 has 4 divisors (see below), whose sum is σ = 870283612. Its totient is φ = 861311232.

The previous prime is 865797397. The next prime is 865797431. The reversal of 865797421 is 124797568.

865797421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 256448196 + 609349225 = 16014^2 + 24685^2 .

It is a cyclic number.

It is not a de Polignac number, because 865797421 - 2²⁹ = 328926509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865797431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2242806 + ... + 2243191.

It is an arithmetic number, because the mean of its divisors is an integer number (217570903).

Almost surely, 2^865797421 is an apocalyptic number.

It is an amenable number.

865797421 is a deficient number, since it is larger than the sum of its proper divisors (4486191).

865797421 is a wasteful number, since it uses less digits than its factorization.

865797421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4486190.

The product of its digits is 846720, while the sum is 49.

The square root of 865797421 is about 29424.4357804869. The cubic root of 865797421 is about 953.1006431486.

The spelling of 865797421 in words is "eight hundred sixty-five million, seven hundred ninety-seven thousand, four hundred twenty-one".