4252721 has 4 divisors (see below), whose sum is σ = 4639344. Its totient is φ = 3866100.

The previous prime is 4252711. The next prime is 4252727. The reversal of 4252721 is 1272524.

It is a happy number.

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 4252721 - 2¹⁰ = 4251697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4252727) 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, 193295 + ... + 193316.

It is an arithmetic number, because the mean of its divisors is an integer number (1159836).

Almost surely, 2^4252721 is an apocalyptic number.

It is an amenable number.

4252721 is a deficient number, since it is larger than the sum of its proper divisors (386623).

4252721 is a wasteful number, since it uses less digits than its factorization.

4252721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386622.

The product of its digits is 1120, while the sum is 23.

The square root of 4252721 is about 2062.2126466492. The cubic root of 4252721 is about 162.0151512527.

The spelling of 4252721 in words is "four million, two hundred fifty-two thousand, seven hundred twenty-one".