1842721 has 4 divisors (see below), whose sum is σ = 1848852. Its totient is φ = 1836592.

The previous prime is 1842719. The next prime is 1842727. The reversal of 1842721 is 1272481.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 608400 + 1234321 = 780^2 + 1111^2 .

It is a cyclic number.

It is not a de Polignac number, because 1842721 - 2¹ = 1842719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1842727) 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, 2590 + ... + 3223.

It is an arithmetic number, because the mean of its divisors is an integer number (462213).

2^1842721 is an apocalyptic number.

It is an amenable number.

1842721 is a deficient number, since it is larger than the sum of its proper divisors (6131).

1842721 is an equidigital number, since it uses as much as digits as its factorization.

1842721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6130.

The product of its digits is 896, while the sum is 25.

The square root of 1842721 is about 1357.4686000052. The cubic root of 1842721 is about 122.5988872495.

The spelling of 1842721 in words is "one million, eight hundred forty-two thousand, seven hundred twenty-one".