1721073 has 4 divisors (see below), whose sum is σ = 2294768. Its totient is φ = 1147380.

The previous prime is 1721023. The next prime is 1721081. The reversal of 1721073 is 3701271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1721073 - 2⁶ = 1721009 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1721003) 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, 286843 + ... + 286848.

It is an arithmetic number, because the mean of its divisors is an integer number (573692).

2^1721073 is an apocalyptic number.

It is an amenable number.

1721073 is a deficient number, since it is larger than the sum of its proper divisors (573695).

1721073 is an equidigital number, since it uses as much as digits as its factorization.

1721073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573694.

The product of its (nonzero) digits is 294, while the sum is 21.

The square root of 1721073 is about 1311.8967184958. The cubic root of 1721073 is about 119.8394380391.

The spelling of 1721073 in words is "one million, seven hundred twenty-one thousand, seventy-three".