4721729 has 2 divisors, whose sum is σ = 4721730. Its totient is φ = 4721728.

The previous prime is 4721723. The next prime is 4721737. The reversal of 4721729 is 9271274.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4579600 + 142129 = 2140^2 + 377^2 .

It is a cyclic number.

It is not a de Polignac number, because 4721729 - 2¹⁶ = 4656193 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 4721695 and 4721704.

It is not a weakly prime, because it can be changed into another prime (4721723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2360864 + 2360865.

It is an arithmetic number, because the mean of its divisors is an integer number (2360865).

Almost surely, 2^4721729 is an apocalyptic number.

It is an amenable number.

4721729 is a deficient number, since it is larger than the sum of its proper divisors (1).

4721729 is an equidigital number, since it uses as much as digits as its factorization.

4721729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 32.

The square root of 4721729 is about 2172.9539801846. The cubic root of 4721729 is about 167.7646103466.

The spelling of 4721729 in words is "four million, seven hundred twenty-one thousand, seven hundred twenty-nine".