863623 has 4 divisors (see below), whose sum is σ = 867928. Its totient is φ = 859320.

The previous prime is 863609. The next prime is 863633. The reversal of 863623 is 326368.

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

It is a cyclic number.

It is not a de Polignac number, because 863623 - 2¹³ = 855431 is a prime.

It is a super-2 number, since 2×863623² = 1491689372258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 863591 and 863600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1836 + ... + 2257.

It is an arithmetic number, because the mean of its divisors is an integer number (216982).

2⁸⁶³⁶²³ is an apocalyptic number.

863623 is a deficient number, since it is larger than the sum of its proper divisors (4305).

863623 is a wasteful number, since it uses less digits than its factorization.

863623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4304.

The product of its digits is 5184, while the sum is 28.

The square root of 863623 is about 929.3131872517. The cubic root of 863623 is about 95.2302080889.

The spelling of 863623 in words is "eight hundred sixty-three thousand, six hundred twenty-three".