1721226 has 16 divisors (see below), whose sum is σ = 3707424. Its totient is φ = 529584.

The previous prime is 1721201. The next prime is 1721227. The reversal of 1721226 is 6221271.

1721226 is nontrivially palindromic in base 12.

It is not an unprimeable number, because it can be changed into a prime (1721227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10956 + ... + 11111.

It is an arithmetic number, because the mean of its divisors is an integer number (231714).

2^1721226 is an apocalyptic number.

1721226 is an abundant number, since it is smaller than the sum of its proper divisors (1986198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1721226 is a wasteful number, since it uses less digits than its factorization.

1721226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22085.

The product of its digits is 336, while the sum is 21.

The square root of 1721226 is about 1311.9550297171. The cubic root of 1721226 is about 119.8429890972.

Adding to 1721226 its reverse (6221271), we get a palindrome (7942497).

The spelling of 1721226 in words is "one million, seven hundred twenty-one thousand, two hundred twenty-six".