863439 has 4 divisors (see below), whose sum is σ = 1151256. Its totient is φ = 575624.

The previous prime is 863393. The next prime is 863479. The reversal of 863439 is 934368.

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 863439 - 2¹¹ = 861391 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863479) 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, 143904 + ... + 143909.

It is an arithmetic number, because the mean of its divisors is an integer number (287814).

2⁸⁶³⁴³⁹ is an apocalyptic number.

863439 is a deficient number, since it is larger than the sum of its proper divisors (287817).

863439 is a wasteful number, since it uses less digits than its factorization.

863439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287816.

The product of its digits is 15552, while the sum is 33.

The square root of 863439 is about 929.2141841363. The cubic root of 863439 is about 95.2234444884.

The spelling of 863439 in words is "eight hundred sixty-three thousand, four hundred thirty-nine".