4725721 has 16 divisors (see below), whose sum is σ = 6346368. Its totient is φ = 3398400.

The previous prime is 4725713. The next prime is 4725727. The reversal of 4725721 is 1275274.

It is a cyclic number.

It is not a de Polignac number, because 4725721 - 2³ = 4725713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4725721.

It is not an unprimeable number, because it can be changed into a prime (4725727) 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 15 ways as a sum of consecutive naturals, for example, 1360 + ... + 3361.

It is an arithmetic number, because the mean of its divisors is an integer number (396648).

Almost surely, 2^4725721 is an apocalyptic number.

It is an amenable number.

4725721 is a deficient number, since it is larger than the sum of its proper divisors (1620647).

4725721 is a wasteful number, since it uses less digits than its factorization.

4725721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4752.

The product of its digits is 3920, while the sum is 28.

The square root of 4725721 is about 2173.8723513583. The cubic root of 4725721 is about 167.8118760604.

It can be divided in two parts, 47257 and 21, that added together give a triangular number (47278 = T₃₀₇).

The spelling of 4725721 in words is "four million, seven hundred twenty-five thousand, seven hundred twenty-one".