862643 has 4 divisors (see below), whose sum is σ = 866640. Its totient is φ = 858648.

The previous prime is 862633. The next prime is 862649. The reversal of 862643 is 346268.

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 862643 - 2⁴ = 862627 is a prime.

It is a d-powerful number, because it can be written as 8³ + 6⁶ + 6⁷ + 2 + 4⁶ + 3¹² .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (862649) 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, 1655 + ... + 2112.

It is an arithmetic number, because the mean of its divisors is an integer number (216660).

2⁸⁶²⁶⁴³ is an apocalyptic number.

862643 is a deficient number, since it is larger than the sum of its proper divisors (3997).

862643 is a wasteful number, since it uses less digits than its factorization.

862643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3996.

The product of its digits is 6912, while the sum is 29.

The square root of 862643 is about 928.7857664715. The cubic root of 862643 is about 95.1941734894.

The spelling of 862643 in words is "eight hundred sixty-two thousand, six hundred forty-three".