1722866 has 4 divisors (see below), whose sum is σ = 2584302. Its totient is φ = 861432.

The previous prime is 1722857. The next prime is 1722869. The reversal of 1722866 is 6682271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6682271 = 1693 ⋅3947.

It can be written as a sum of positive squares in only one way, i.e., 1635841 + 87025 = 1279^2 + 295^2 .

It is not an unprimeable number, because it can be changed into a prime (1722869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430715 + ... + 430718.

2^1722866 is an apocalyptic number.

1722866 is a deficient number, since it is larger than the sum of its proper divisors (861436).

1722866 is an equidigital number, since it uses as much as digits as its factorization.

1722866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861435.

The product of its digits is 8064, while the sum is 32.

The square root of 1722866 is about 1312.5799023298. The cubic root of 1722866 is about 119.8810395164.

The spelling of 1722866 in words is "one million, seven hundred twenty-two thousand, eight hundred sixty-six".