2086721 has 16 divisors (see below), whose sum is σ = 2682624. Its totient is φ = 1577664.

The previous prime is 2086697. The next prime is 2086723. The reversal of 2086721 is 1276802.

It is a cyclic number.

It is not a de Polignac number, because 2086721 - 2⁶ = 2086657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2086723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1595 + ... + 2591.

It is an arithmetic number, because the mean of its divisors is an integer number (167664).

It is the magic constant of a 161 × 161 magic square.

2^2086721 is an apocalyptic number.

It is an amenable number.

2086721 is a deficient number, since it is larger than the sum of its proper divisors (595903).

2086721 is a wasteful number, since it uses less digits than its factorization.

2086721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 2086721 is about 1444.5487184585. The cubic root of 2086721 is about 127.7874279346.

The spelling of 2086721 in words is "two million, eighty-six thousand, seven hundred twenty-one".