4225721 has 8 divisors (see below), whose sum is σ = 4432320. Its totient is φ = 4021072.

The previous prime is 4225709. The next prime is 4225729. The reversal of 4225721 is 1275224.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4225721 - 2¹⁸ = 3963577 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4225729) 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 7 ways as a sum of consecutive naturals, for example, 5846 + ... + 6528.

It is an arithmetic number, because the mean of its divisors is an integer number (554040).

Almost surely, 2^4225721 is an apocalyptic number.

It is an amenable number.

4225721 is a deficient number, since it is larger than the sum of its proper divisors (206599).

4225721 is a wasteful number, since it uses less digits than its factorization.

4225721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975.

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

The square root of 4225721 is about 2055.6558564118. The cubic root of 4225721 is about 161.6715516763.

The spelling of 4225721 in words is "four million, two hundred twenty-five thousand, seven hundred twenty-one".