2956721 has 4 divisors (see below), whose sum is σ = 2960244. Its totient is φ = 2953200.

The previous prime is 2956703. The next prime is 2956727. The reversal of 2956721 is 1276592.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2217121 + 739600 = 1489^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 2956721 - 2¹⁸ = 2694577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2956727) 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, 311 + ... + 2451.

It is an arithmetic number, because the mean of its divisors is an integer number (740061).

2^2956721 is an apocalyptic number.

It is an amenable number.

2956721 is a deficient number, since it is larger than the sum of its proper divisors (3523).

2956721 is a wasteful number, since it uses less digits than its factorization.

2956721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3522.

The product of its digits is 7560, while the sum is 32.

The square root of 2956721 is about 1719.5118493340. The cubic root of 2956721 is about 143.5280491654.

The spelling of 2956721 in words is "two million, nine hundred fifty-six thousand, seven hundred twenty-one".