3056721 has 4 divisors (see below), whose sum is σ = 4075632. Its totient is φ = 2037812.

The previous prime is 3056717. The next prime is 3056759. The reversal of 3056721 is 1276503.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1276503 = 3 ⋅425501.

It is a cyclic number.

It is not a de Polignac number, because 3056721 - 2² = 3056717 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 3056691 and 3056700.

It is not an unprimeable number, because it can be changed into a prime (3056791) 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, 509451 + ... + 509456.

It is an arithmetic number, because the mean of its divisors is an integer number (1018908).

Almost surely, 2^3056721 is an apocalyptic number.

It is an amenable number.

3056721 is a deficient number, since it is larger than the sum of its proper divisors (1018911).

3056721 is a wasteful number, since it uses less digits than its factorization.

3056721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018910.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 3056721 is about 1748.3480774720. The cubic root of 3056721 is about 145.1282416791.

The spelling of 3056721 in words is "three million, fifty-six thousand, seven hundred twenty-one".