1721841 has 8 divisors (see below), whose sum is σ = 2504544. Its totient is φ = 1043520.

The previous prime is 1721831. The next prime is 1721857. The reversal of 1721841 is 1481271.

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

It is not a de Polignac number, because 1721841 - 2⁵ = 1721809 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1721831) 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, 26056 + ... + 26121.

It is an arithmetic number, because the mean of its divisors is an integer number (313068).

2^1721841 is an apocalyptic number.

1721841 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1721841 is a deficient number, since it is larger than the sum of its proper divisors (782703).

1721841 is a wasteful number, since it uses less digits than its factorization.

1721841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52191.

The product of its digits is 448, while the sum is 24.

The square root of 1721841 is about 1312.1893918181. The cubic root of 1721841 is about 119.8572608356.

The spelling of 1721841 in words is "one million, seven hundred twenty-one thousand, eight hundred forty-one".