864749 has 4 divisors (see below), whose sum is σ = 869760. Its totient is φ = 859740.

The previous prime is 864737. The next prime is 864757. The reversal of 864749 is 947468.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 864749 - 2⁴ = 864733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864049) 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, 2237 + ... + 2594.

It is an arithmetic number, because the mean of its divisors is an integer number (217440).

2⁸⁶⁴⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

864749 is a deficient number, since it is larger than the sum of its proper divisors (5011).

864749 is a wasteful number, since it uses less digits than its factorization.

864749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5010.

The product of its digits is 48384, while the sum is 38.

The square root of 864749 is about 929.9188136606. The cubic root of 864749 is about 95.2715774696.

The spelling of 864749 in words is "eight hundred sixty-four thousand, seven hundred forty-nine".