2728421 has 8 divisors (see below), whose sum is σ = 2863680. Its totient is φ = 2594592.

The previous prime is 2728409. The next prime is 2728447. The reversal of 2728421 is 1248272.

2728421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2728421 - 2⁶ = 2728357 is a prime.

It is a super-3 number, since 3×2728421³ = 60933399085220887383, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2728471) 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 7 ways as a sum of consecutive naturals, for example, 7010 + ... + 7388.

It is an arithmetic number, because the mean of its divisors is an integer number (357960).

2^2728421 is an apocalyptic number.

It is an amenable number.

2728421 is a deficient number, since it is larger than the sum of its proper divisors (135259).

2728421 is a wasteful number, since it uses less digits than its factorization.

2728421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715.

The product of its digits is 1792, while the sum is 26.

The square root of 2728421 is about 1651.7932679364. The cubic root of 2728421 is about 139.7345480188.

The spelling of 2728421 in words is "two million, seven hundred twenty-eight thousand, four hundred twenty-one".