866249 has 4 divisors (see below), whose sum is σ = 903936. Its totient is φ = 828564.

The previous prime is 866231. The next prime is 866279. The reversal of 866249 is 942668.

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 866249 - 2⁸ = 865993 is a prime.

It is a d-powerful number, because it can be written as 8 + 6⁶ + 2¹³ + 6⁷ + 4² + 9⁶ .

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (866279) 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, 18809 + ... + 18854.

It is an arithmetic number, because the mean of its divisors is an integer number (225984).

2⁸⁶⁶²⁴⁹ is an apocalyptic number.

It is an amenable number.

866249 is a deficient number, since it is larger than the sum of its proper divisors (37687).

866249 is a wasteful number, since it uses less digits than its factorization.

866249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37686.

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

The square root of 866249 is about 930.7249862338. The cubic root of 866249 is about 95.3266319098.

The spelling of 866249 in words is "eight hundred sixty-six thousand, two hundred forty-nine".