864529 has 4 divisors (see below), whose sum is σ = 866484. Its totient is φ = 862576.

The previous prime is 864511. The next prime is 864533. The reversal of 864529 is 925468.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 762129 + 102400 = 873^2 + 320^2 .

It is a cyclic number.

It is not a de Polignac number, because 864529 - 2¹¹ = 862481 is a prime.

It is a Duffinian number.

864529 is a lucky number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 864494 and 864503.

It is not an unprimeable number, because it can be changed into a prime (864509) 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, 39 + ... + 1315.

It is an arithmetic number, because the mean of its divisors is an integer number (216621).

2⁸⁶⁴⁵²⁹ is an apocalyptic number.

It is an amenable number.

864529 is a deficient number, since it is larger than the sum of its proper divisors (1955).

864529 is a wasteful number, since it uses less digits than its factorization.

864529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954.

The product of its digits is 17280, while the sum is 34.

The square root of 864529 is about 929.8005162399. The cubic root of 864529 is about 95.2634974661.

The spelling of 864529 in words is "eight hundred sixty-four thousand, five hundred twenty-nine".