866429 has 4 divisors (see below), whose sum is σ = 889884. Its totient is φ = 842976.

The previous prime is 866417. The next prime is 866431. The reversal of 866429 is 924668.

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 592900 + 273529 = 770^2 + 523^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866029) 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, 11672 + ... + 11745.

It is an arithmetic number, because the mean of its divisors is an integer number (222471).

2⁸⁶⁶⁴²⁹ is an apocalyptic number.

It is an amenable number.

866429 is a deficient number, since it is larger than the sum of its proper divisors (23455).

866429 is a wasteful number, since it uses less digits than its factorization.

866429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23454.

The product of its digits is 20736, while the sum is 35.

The square root of 866429 is about 930.8216800225. The cubic root of 866429 is about 95.3332341705. Note that the first 3 decimals are identical.

The spelling of 866429 in words is "eight hundred sixty-six thousand, four hundred twenty-nine".