2943721 has 4 divisors (see below), whose sum is σ = 3211344. Its totient is φ = 2676100.

The previous prime is 2943713. The next prime is 2943739. The reversal of 2943721 is 1273492.

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 2943721 - 2³ = 2943713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2943721.

It is not an unprimeable number, because it can be changed into a prime (2943781) 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 3 ways as a sum of consecutive naturals, for example, 133795 + ... + 133816.

It is an arithmetic number, because the mean of its divisors is an integer number (802836).

2^2943721 is an apocalyptic number.

It is an amenable number.

2943721 is a deficient number, since it is larger than the sum of its proper divisors (267623).

2943721 is a wasteful number, since it uses less digits than its factorization.

2943721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267622.

The product of its digits is 3024, while the sum is 28.

The square root of 2943721 is about 1715.7275424729. The cubic root of 2943721 is about 143.3173872051.

The spelling of 2943721 in words is "two million, nine hundred forty-three thousand, seven hundred twenty-one".