4668721 has 2 divisors, whose sum is σ = 4668722. Its totient is φ = 4668720.

The previous prime is 4668691. The next prime is 4668733. The reversal of 4668721 is 1278664.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4264225 + 404496 = 2065^2 + 636^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4668721 is a prime.

It is not a weakly prime, because it can be changed into another prime (4668791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2334360 + 2334361.

It is an arithmetic number, because the mean of its divisors is an integer number (2334361).

Almost surely, 2^4668721 is an apocalyptic number.

It is an amenable number.

4668721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4668721 is an equidigital number, since it uses as much as digits as its factorization.

4668721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 34.

The square root of 4668721 is about 2160.7223329248. The cubic root of 4668721 is about 167.1344489611.

The spelling of 4668721 in words is "four million, six hundred sixty-eight thousand, seven hundred twenty-one".