864958 has 4 divisors (see below), whose sum is σ = 1297440. Its totient is φ = 432478.

The previous prime is 864953. The next prime is 864959. The reversal of 864958 is 859468.

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

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 864958.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216238 + ... + 216241.

It is an arithmetic number, because the mean of its divisors is an integer number (324360).

2⁸⁶⁴⁹⁵⁸ is an apocalyptic number.

864958 is a deficient number, since it is larger than the sum of its proper divisors (432482).

864958 is a wasteful number, since it uses less digits than its factorization.

864958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432481.

The product of its digits is 69120, while the sum is 40.

The square root of 864958 is about 930.0311822729. The cubic root of 864958 is about 95.2792522036.

The spelling of 864958 in words is "eight hundred sixty-four thousand, nine hundred fifty-eight".