4906721 has 4 divisors (see below), whose sum is σ = 4938132. Its totient is φ = 4875312.

The previous prime is 4906717. The next prime is 4906723. The reversal of 4906721 is 1276094.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1276094 = 2 ⋅638047.

It can be written as a sum of positive squares in 2 ways, for example, as 2217121 + 2689600 = 1489^2 + 1640^2 .

It is a cyclic number.

It is not a de Polignac number, because 4906721 - 2² = 4906717 is a prime.

It is a super-3 number, since 3×4906721³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4906723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15470 + ... + 15783.

It is an arithmetic number, because the mean of its divisors is an integer number (1234533).

Almost surely, 2^4906721 is an apocalyptic number.

It is an amenable number.

4906721 is a deficient number, since it is larger than the sum of its proper divisors (31411).

4906721 is a wasteful number, since it uses less digits than its factorization.

4906721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31410.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 4906721 is about 2215.1119610530. Note that the first 3 decimals coincide. The cubic root of 4906721 is about 169.9275469800.

The spelling of 4906721 in words is "four million, nine hundred six thousand, seven hundred twenty-one".