4268721 has 4 divisors (see below), whose sum is σ = 5691632. Its totient is φ = 2845812.

The previous prime is 4268699. The next prime is 4268729. The reversal of 4268721 is 1278624.

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 4268721 - 2⁵ = 4268689 is a prime.

It is a super-3 number, since 3×4268721³ (a number of 21 digits) contains 333 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

4268721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4268729) 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, 711451 + ... + 711456.

It is an arithmetic number, because the mean of its divisors is an integer number (1422908).

Almost surely, 2^4268721 is an apocalyptic number.

It is an amenable number.

4268721 is a deficient number, since it is larger than the sum of its proper divisors (1422911).

4268721 is a wasteful number, since it uses less digits than its factorization.

4268721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422910.

The product of its digits is 5376, while the sum is 30.

The square root of 4268721 is about 2066.0883330584. The cubic root of 4268721 is about 162.2180800184.

The spelling of 4268721 in words is "four million, two hundred sixty-eight thousand, seven hundred twenty-one".