853721 has 4 divisors (see below), whose sum is σ = 931344. Its totient is φ = 776100.

The previous prime is 853717. The next prime is 853733. The reversal of 853721 is 127358.

853721 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 853721 - 2² = 853717 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (855721) 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, 38795 + ... + 38816.

It is an arithmetic number, because the mean of its divisors is an integer number (232836).

2⁸⁵³⁷²¹ is an apocalyptic number.

It is an amenable number.

853721 is a deficient number, since it is larger than the sum of its proper divisors (77623).

853721 is a wasteful number, since it uses less digits than its factorization.

853721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77622.

The product of its digits is 1680, while the sum is 26.

The square root of 853721 is about 923.9702376159. The cubic root of 853721 is about 94.8648493720.

It can be divided in two parts, 8537 and 21, that added together give a palindrome (8558).

The spelling of 853721 in words is "eight hundred fifty-three thousand, seven hundred twenty-one".