5642721 has 12 divisors (see below), whose sum is σ = 9315072. Its totient is φ = 3224376.

The previous prime is 5642717. The next prime is 5642729. The reversal of 5642721 is 1272465.

It is not a de Polignac number, because 5642721 - 2² = 5642717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5642729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44721 + ... + 44846.

It is an arithmetic number, because the mean of its divisors is an integer number (776256).

Almost surely, 2^5642721 is an apocalyptic number.

It is an amenable number.

5642721 is a deficient number, since it is larger than the sum of its proper divisors (3672351).

5642721 is a wasteful number, since it uses less digits than its factorization.

5642721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89580 (or 89577 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 5642721 is about 2375.4412221733. The cubic root of 5642721 is about 178.0312300546.

The spelling of 5642721 in words is "five million, six hundred forty-two thousand, seven hundred twenty-one".