4022729 has 4 divisors (see below), whose sum is σ = 4062660. Its totient is φ = 3982800.

The previous prime is 4022719. The next prime is 4022741. The reversal of 4022729 is 9272204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3822025 + 200704 = 1955^2 + 448^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4022729 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4022698 and 4022707.

It is not an unprimeable number, because it can be changed into a prime (4022719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19814 + ... + 20015.

It is an arithmetic number, because the mean of its divisors is an integer number (1015665).

Almost surely, 2^4022729 is an apocalyptic number.

It is an amenable number.

4022729 is a deficient number, since it is larger than the sum of its proper divisors (39931).

4022729 is a wasteful number, since it uses less digits than its factorization.

4022729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39930.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 4022729 is about 2005.6742008611. The cubic root of 4022729 is about 159.0402044871.

The spelling of 4022729 in words is "four million, twenty-two thousand, seven hundred twenty-nine".