853621 has 8 divisors (see below), whose sum is σ = 912600. Its totient is φ = 795648.

The previous prime is 853597. The next prime is 853637. The reversal of 853621 is 126358.

It is a happy number.

853621 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 34596 + 819025 = 186^2 + 905^2 .

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 853621 - 2⁷ = 853493 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 (854621) 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, 2365 + ... + 2701.

It is an arithmetic number, because the mean of its divisors is an integer number (114075).

2⁸⁵³⁶²¹ is an apocalyptic number.

It is an amenable number.

853621 is a deficient number, since it is larger than the sum of its proper divisors (58979).

853621 is a wasteful number, since it uses less digits than its factorization.

853621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503.

The product of its digits is 1440, while the sum is 25.

The square root of 853621 is about 923.9161217340. The cubic root of 853621 is about 94.8611452519.

Adding to 853621 its reverse (126358), we get a palindrome (979979).

The spelling of 853621 in words is "eight hundred fifty-three thousand, six hundred twenty-one".