864436 has 12 divisors (see below), whose sum is σ = 1521828. Its totient is φ = 429632.

The previous prime is 864427. The next prime is 864439. The reversal of 864436 is 634468.

It can be written as a sum of positive squares in 2 ways, for example, as 608400 + 256036 = 780^2 + 506^2 .

It is a junction number, because it is equal to n+sod(n) for n = 864398 and 864407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864439) 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, 240 + ... + 1336.

It is an arithmetic number, because the mean of its divisors is an integer number (126819).

2⁸⁶⁴⁴³⁶ is an apocalyptic number.

It is an amenable number.

864436 is a deficient number, since it is larger than the sum of its proper divisors (657392).

864436 is a wasteful number, since it uses less digits than its factorization.

864436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298 (or 1296 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 864436 is about 929.7505041677. The cubic root of 864436 is about 95.2600814161.

The spelling of 864436 in words is "eight hundred sixty-four thousand, four hundred thirty-six".