2705721 has 4 divisors (see below), whose sum is σ = 3607632. Its totient is φ = 1803812.

The previous prime is 2705693. The next prime is 2705741. The reversal of 2705721 is 1275072.

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 2705721 - 2¹⁰ = 2704697 is a prime.

It is a super-2 number, since 2×2705721² = 14641852259682, which contains 22 as substring.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 2705691 and 2705700.

It is not an unprimeable number, because it can be changed into a prime (2705741) 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, 450951 + ... + 450956.

It is an arithmetic number, because the mean of its divisors is an integer number (901908).

2^2705721 is an apocalyptic number.

It is an amenable number.

2705721 is a deficient number, since it is larger than the sum of its proper divisors (901911).

2705721 is an equidigital number, since it uses as much as digits as its factorization.

2705721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901910.

The product of its (nonzero) digits is 980, while the sum is 24.

The square root of 2705721 is about 1644.9075961889. The cubic root of 2705721 is about 139.3459457358.

The spelling of 2705721 in words is "two million, seven hundred five thousand, seven hundred twenty-one".