1721741 has 4 divisors (see below), whose sum is σ = 1967712. Its totient is φ = 1475772.

The previous prime is 1721729. The next prime is 1721749. The reversal of 1721741 is 1471271.

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 a cyclic number.

It is not a de Polignac number, because 1721741 - 2¹⁸ = 1459597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721749) 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, 122975 + ... + 122988.

It is an arithmetic number, because the mean of its divisors is an integer number (491928).

2^1721741 is an apocalyptic number.

It is an amenable number.

1721741 is a deficient number, since it is larger than the sum of its proper divisors (245971).

1721741 is an equidigital number, since it uses as much as digits as its factorization.

1721741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245970.

The product of its digits is 392, while the sum is 23.

The square root of 1721741 is about 1312.1512870092. The cubic root of 1721741 is about 119.8549404591.

The spelling of 1721741 in words is "one million, seven hundred twenty-one thousand, seven hundred forty-one".