1721422 has 8 divisors (see below), whose sum is σ = 2637216. Its totient is φ = 842352.

The previous prime is 1721417. The next prime is 1721441. The reversal of 1721422 is 2241271.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1721422.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9063 + ... + 9250.

It is an arithmetic number, because the mean of its divisors is an integer number (329652).

2^1721422 is an apocalyptic number.

1721422 is a deficient number, since it is larger than the sum of its proper divisors (915794).

1721422 is a wasteful number, since it uses less digits than its factorization.

1721422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18362.

The product of its digits is 224, while the sum is 19.

The square root of 1721422 is about 1312.0297252730. The cubic root of 1721422 is about 119.8475378576.

Adding to 1721422 its reverse (2241271), we get a palindrome (3962693).

The spelling of 1721422 in words is "one million, seven hundred twenty-one thousand, four hundred twenty-two".