1721022 has 16 divisors (see below), whose sum is σ = 3455760. Its totient is φ = 571392.

The previous prime is 1721011. The next prime is 1721023. The reversal of 1721022 is 2201271.

It is a junction number, because it is equal to n+sod(n) for n = 1720992 and 1721010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721023) 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 in 7 ways as a sum of consecutive naturals, for example, 1854 + ... + 2622.

It is an arithmetic number, because the mean of its divisors is an integer number (215985).

2^1721022 is an apocalyptic number.

1721022 is an abundant number, since it is smaller than the sum of its proper divisors (1734738).

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

1721022 is a wasteful number, since it uses less digits than its factorization.

1721022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 1721022 is about 1311.8772808460. The cubic root of 1721022 is about 119.8382543063.

Adding to 1721022 its reverse (2201271), we get a palindrome (3922293).

Subtracting 1721022 from its reverse (2201271), we obtain a square (480249 = 693²).

The spelling of 1721022 in words is "one million, seven hundred twenty-one thousand, twenty-two".