863621 has 4 divisors (see below), whose sum is σ = 942144. Its totient is φ = 785100.

The previous prime is 863609. The next prime is 863633. The reversal of 863621 is 126368.

863621 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 an interprime number because it is at equal distance from previous prime (863609) and next prime (863633).

It is a cyclic number.

It is not a de Polignac number, because 863621 - 2¹⁴ = 847237 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863641) 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, 39245 + ... + 39266.

It is an arithmetic number, because the mean of its divisors is an integer number (235536).

2⁸⁶³⁶²¹ is an apocalyptic number.

It is an amenable number.

863621 is a deficient number, since it is larger than the sum of its proper divisors (78523).

863621 is a wasteful number, since it uses less digits than its factorization.

863621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78522.

The product of its digits is 1728, while the sum is 26.

The square root of 863621 is about 929.3121111876. The cubic root of 863621 is about 95.2301345767.

Adding to 863621 its reverse (126368), we get a palindrome (989989).

The spelling of 863621 in words is "eight hundred sixty-three thousand, six hundred twenty-one".