866722 has 4 divisors (see below), whose sum is σ = 1300086. Its totient is φ = 433360.

The previous prime is 866717. The next prime is 866737. The reversal of 866722 is 227668.

It is a happy number.

866722 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.

It can be written as a sum of positive squares in only one way, i.e., 505521 + 361201 = 711^2 + 601^2 .

It is an Ulam number.

It is a plaindrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216679 + ... + 216682.

2⁸⁶⁶⁷²² is an apocalyptic number.

866722 is a deficient number, since it is larger than the sum of its proper divisors (433364).

866722 is a wasteful number, since it uses less digits than its factorization.

866722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433363.

The product of its digits is 8064, while the sum is 31.

The square root of 866722 is about 930.9790545442. The cubic root of 866722 is about 95.3439792285.

The spelling of 866722 in words is "eight hundred sixty-six thousand, seven hundred twenty-two".