864646 has 4 divisors (see below), whose sum is σ = 1296972. Its totient is φ = 432322.

The previous prime is 864641. The next prime is 864673. The reversal of 864646 is 646468.

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

It is a super-2 number, since 2×864646² = 1495225410632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216160 + ... + 216163.

It is an arithmetic number, because the mean of its divisors is an integer number (324243).

2⁸⁶⁴⁶⁴⁶ is an apocalyptic number.

864646 is a deficient number, since it is larger than the sum of its proper divisors (432326).

864646 is a wasteful number, since it uses less digits than its factorization.

864646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432325.

The product of its digits is 27648, while the sum is 34.

The square root of 864646 is about 929.8634308327. The cubic root of 864646 is about 95.2677947295.

The spelling of 864646 in words is "eight hundred sixty-four thousand, six hundred forty-six".