1722266 has 16 divisors (see below), whose sum is σ = 3179904. Its totient is φ = 681264.

The previous prime is 1722251. The next prime is 1722283. The reversal of 1722266 is 6622271.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a d-powerful number, because it can be written as 1 + 7² + 2³ + 2¹¹ + 2¹⁵ + 6⁵ + 6⁸ .

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 4550 + ... + 4913.

It is an arithmetic number, because the mean of its divisors is an integer number (198744).

2^1722266 is an apocalyptic number.

1722266 is a deficient number, since it is larger than the sum of its proper divisors (1457638).

1722266 is a wasteful number, since it uses less digits than its factorization.

1722266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9485.

The product of its digits is 2016, while the sum is 26.

The square root of 1722266 is about 1312.3513249127. The cubic root of 1722266 is about 119.8671214336.

Multiplying 1722266 by its sum of digits (26), we get a triangular number (44778916 = T₉₄₆₃).

The spelling of 1722266 in words is "one million, seven hundred twenty-two thousand, two hundred sixty-six".