4293721 has 2 divisors, whose sum is σ = 4293722. Its totient is φ = 4293720.

The previous prime is 4293713. The next prime is 4293727. The reversal of 4293721 is 1273924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3920400 + 373321 = 1980^2 + 611^2 .

It is a cyclic number.

It is not a de Polignac number, because 4293721 - 2³ = 4293713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4293721.

It is not a weakly prime, because it can be changed into another prime (4293727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2146860 + 2146861.

It is an arithmetic number, because the mean of its divisors is an integer number (2146861).

Almost surely, 2^4293721 is an apocalyptic number.

It is an amenable number.

4293721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4293721 is an equidigital number, since it uses as much as digits as its factorization.

4293721 is an evil number, because the sum of its binary digits is even.

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

The square root of 4293721 is about 2072.1295808902. The cubic root of 4293721 is about 162.5341435158.

The spelling of 4293721 in words is "four million, two hundred ninety-three thousand, seven hundred twenty-one".