1721922 has 8 divisors (see below), whose sum is σ = 3443856. Its totient is φ = 573972.

The previous prime is 1721921. The next prime is 1721927. The reversal of 1721922 is 2291271.

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

1721922 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 1721892 and 1721901.

It is not an unprimeable number, because it can be changed into a prime (1721921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143488 + ... + 143499.

It is an arithmetic number, because the mean of its divisors is an integer number (430482).

2^1721922 is an apocalyptic number.

1721922 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1721922 is a wasteful number, since it uses less digits than its factorization.

1721922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286992.

The product of its digits is 504, while the sum is 24.

The square root of 1721922 is about 1312.2202559022. The cubic root of 1721922 is about 119.8591402747.

The spelling of 1721922 in words is "one million, seven hundred twenty-one thousand, nine hundred twenty-two".