4067721 has 12 divisors (see below), whose sum is σ = 6715072. Its totient is φ = 2324376.

The previous prime is 4067717. The next prime is 4067731. The reversal of 4067721 is 1277604.

It is not a de Polignac number, because 4067721 - 2² = 4067717 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4067731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32221 + ... + 32346.

Almost surely, 2^4067721 is an apocalyptic number.

It is an amenable number.

4067721 is a deficient number, since it is larger than the sum of its proper divisors (2647351).

4067721 is a wasteful number, since it uses less digits than its factorization.

4067721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64580 (or 64577 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 4067721 is about 2016.8591919120. The cubic root of 4067721 is about 159.6309331943.

The spelling of 4067721 in words is "four million, sixty-seven thousand, seven hundred twenty-one".