4042729 has 2 divisors, whose sum is σ = 4042730. Its totient is φ = 4042728.

The previous prime is 4042721. The next prime is 4042757. The reversal of 4042729 is 9272404.

It is an a-pointer prime, because the next prime (4042757) can be obtained adding 4042729 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2096704 + 1946025 = 1448^2 + 1395^2 .

It is a cyclic number.

It is not a de Polignac number, because 4042729 - 2³ = 4042721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4042697 and 4042706.

It is not a weakly prime, because it can be changed into another prime (4042721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2021364 + 2021365.

It is an arithmetic number, because the mean of its divisors is an integer number (2021365).

Almost surely, 2^4042729 is an apocalyptic number.

It is an amenable number.

4042729 is a deficient number, since it is larger than the sum of its proper divisors (1).

4042729 is an equidigital number, since it uses as much as digits as its factorization.

4042729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 4042729 is about 2010.6538737436. The cubic root of 4042729 is about 159.3033382299.

The spelling of 4042729 in words is "four million, forty-two thousand, seven hundred twenty-nine".