4016721 has 4 divisors (see below), whose sum is σ = 5355632. Its totient is φ = 2677812.

The previous prime is 4016713. The next prime is 4016731. The reversal of 4016721 is 1276104.

4016721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 4016721 - 2³ = 4016713 is a prime.

It is a super-3 number, since 3×4016721³ (a number of 21 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4016731) 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 3 ways as a sum of consecutive naturals, for example, 669451 + ... + 669456.

It is an arithmetic number, because the mean of its divisors is an integer number (1338908).

Almost surely, 2^4016721 is an apocalyptic number.

It is an amenable number.

4016721 is a deficient number, since it is larger than the sum of its proper divisors (1338911).

4016721 is a wasteful number, since it uses less digits than its factorization.

4016721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338910.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 4016721 is about 2004.1758904847. The cubic root of 4016721 is about 158.9609888075.

It can be divided in two parts, 40 and 16721, that added together give a palindrome (16761).

The spelling of 4016721 in words is "four million, sixteen thousand, seven hundred twenty-one".