4342721 has 4 divisors (see below), whose sum is σ = 4492500. Its totient is φ = 4192944.

The previous prime is 4342717. The next prime is 4342757. The reversal of 4342721 is 1272434.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1272434 = 2 ⋅636217.

It can be written as a sum of positive squares in 2 ways, for example, as 774400 + 3568321 = 880^2 + 1889^2 .

It is a cyclic number.

It is not a de Polignac number, because 4342721 - 2² = 4342717 is a prime.

It is a d-powerful number, because it can be written as 4² + 3² + 4¹¹ + 2⁹ + 7⁵ + 2¹⁷ + 1 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4342771) 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, 74846 + ... + 74903.

It is an arithmetic number, because the mean of its divisors is an integer number (1123125).

Almost surely, 2^4342721 is an apocalyptic number.

It is an amenable number.

4342721 is a deficient number, since it is larger than the sum of its proper divisors (149779).

4342721 is a wasteful number, since it uses less digits than its factorization.

4342721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149778.

The product of its digits is 1344, while the sum is 23.

The square root of 4342721 is about 2083.9196241698. The cubic root of 4342721 is about 163.1500869605.

The spelling of 4342721 in words is "four million, three hundred forty-two thousand, seven hundred twenty-one".