864244 has 6 divisors (see below), whose sum is σ = 1512434. Its totient is φ = 432120.

The previous prime is 864223. The next prime is 864251. The reversal of 864244 is 442468.

864244 is an esthetic number in base 5, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in only one way, i.e., 672400 + 191844 = 820^2 + 438^2 .

It is a congruent number.

It is an unprimeable number.

864244 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108027 + ... + 108034.

2⁸⁶⁴²⁴⁴ is an apocalyptic number.

It is an amenable number.

864244 is a deficient number, since it is larger than the sum of its proper divisors (648190).

864244 is a wasteful number, since it uses less digits than its factorization.

864244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216065 (or 216063 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

The square root of 864244 is about 929.6472449268. The cubic root of 864244 is about 95.2530281505.

It can be divided in two parts, 86424 and 4, that multiplied together give a triangular number (345696 = T₈₃₁).

The spelling of 864244 in words is "eight hundred sixty-four thousand, two hundred forty-four".