866469 has 4 divisors (see below), whose sum is σ = 1155296. Its totient is φ = 577644.

The previous prime is 866461. The next prime is 866471. The reversal of 866469 is 964668.

866469 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 866469 - 2³ = 866461 is a prime.

It is a super-2 number, since 2×866469² = 1501537055922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866461) 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, 144409 + ... + 144414.

It is an arithmetic number, because the mean of its divisors is an integer number (288824).

2⁸⁶⁶⁴⁶⁹ is an apocalyptic number.

It is an amenable number.

866469 is a deficient number, since it is larger than the sum of its proper divisors (288827).

866469 is a wasteful number, since it uses less digits than its factorization.

866469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288826.

The product of its digits is 62208, while the sum is 39.

The square root of 866469 is about 930.8431661671. The cubic root of 866469 is about 95.3347012154.

It can be divided in two parts, 86 and 6469, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 866469 in words is "eight hundred sixty-six thousand, four hundred sixty-nine".