860340821 has 8 divisors (see below), whose sum is σ = 870128280. Its totient is φ = 850572288.

The previous prime is 860340787. The next prime is 860340823. The reversal of 860340821 is 128043068.

860340821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 356832100 + 503508721 = 18890^2 + 22439^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 860340821 - 2¹⁸ = 860078677 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 (860340823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99545 + ... + 107841.

It is an arithmetic number, because the mean of its divisors is an integer number (108766035).

Almost surely, 2^860340821 is an apocalyptic number.

It is an amenable number.

860340821 is a deficient number, since it is larger than the sum of its proper divisors (9787459).

860340821 is a wasteful number, since it uses less digits than its factorization.

860340821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9463.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 860340821 is about 29331.5669714388. The cubic root of 860340821 is about 951.0941487645.

Adding to 860340821 its reverse (128043068), we get a palindrome (988383889).

The spelling of 860340821 in words is "eight hundred sixty million, three hundred forty thousand, eight hundred twenty-one".