4382721 has 16 divisors (see below), whose sum is σ = 7420800. Its totient is φ = 2504304.

The previous prime is 4382713. The next prime is 4382723. The reversal of 4382721 is 1272834.

It is not a de Polignac number, because 4382721 - 2³ = 4382713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (4382723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11406 + ... + 11783.

It is an arithmetic number, because the mean of its divisors is an integer number (463800).

It is a Proth number, since it is equal to 535 ⋅ 2¹³ + 1 and 535 < 2¹³.

Almost surely, 2^4382721 is an apocalyptic number.

It is an amenable number.

4382721 is a deficient number, since it is larger than the sum of its proper divisors (3038079).

4382721 is a wasteful number, since it uses less digits than its factorization.

4382721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23205 (or 23199 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 4382721 is about 2093.4949247610. The cubic root of 4382721 is about 163.6494719297.

The spelling of 4382721 in words is "four million, three hundred eighty-two thousand, seven hundred twenty-one".