2085721 has 8 divisors (see below), whose sum is σ = 2294784. Its totient is φ = 1879920.

The previous prime is 2085703. The next prime is 2085731. The reversal of 2085721 is 1275802.

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

It is a cyclic number.

It is not a de Polignac number, because 2085721 - 2¹⁷ = 1954649 is a prime.

It is a Duffinian number.

2085721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2085701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 651 + ... + 2143.

It is an arithmetic number, because the mean of its divisors is an integer number (286848).

2^2085721 is an apocalyptic number.

It is an amenable number.

2085721 is a deficient number, since it is larger than the sum of its proper divisors (209063).

2085721 is a wasteful number, since it uses less digits than its factorization.

2085721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 2085721 is about 1444.2025481213. The cubic root of 2085721 is about 127.7670118774.

It can be divided in two parts, 208 and 5721, that added together give a square (5929 = 77²).

The spelling of 2085721 in words is "two million, eighty-five thousand, seven hundred twenty-one".