4126721 has 4 divisors (see below), whose sum is σ = 4238292. Its totient is φ = 4015152.

The previous prime is 4126697. The next prime is 4126757. The reversal of 4126721 is 1276214.

4126721 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1690000 + 2436721 = 1300^2 + 1561^2 .

It is a cyclic number.

It is not a de Polignac number, because 4126721 - 2⁶ = 4126657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4126621) 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, 55730 + ... + 55803.

It is an arithmetic number, because the mean of its divisors is an integer number (1059573).

It is a Proth number, since it is equal to 2015 ⋅ 2¹¹ + 1 and 2015 < 2¹¹.

Almost surely, 2^4126721 is an apocalyptic number.

It is an amenable number.

4126721 is a deficient number, since it is larger than the sum of its proper divisors (111571).

4126721 is a wasteful number, since it uses less digits than its factorization.

4126721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111570.

The product of its digits is 672, while the sum is 23.

The square root of 4126721 is about 2031.4332378890. The cubic root of 4126721 is about 160.3990171021.

It can be divided in two parts, 41 and 26721, that added together give a palindrome (26762).

The spelling of 4126721 in words is "four million, one hundred twenty-six thousand, seven hundred twenty-one".