4001729 has 4 divisors (see below), whose sum is σ = 4024020. Its totient is φ = 3979440.

The previous prime is 4001719. The next prime is 4001741. The reversal of 4001729 is 9271004.

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 207025 + 3794704 = 455^2 + 1948^2 .

It is a cyclic number.

It is not a de Polignac number, because 4001729 - 2⁴ = 4001713 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4001719) 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, 10874 + ... + 11235.

It is an arithmetic number, because the mean of its divisors is an integer number (1006005).

Almost surely, 2^4001729 is an apocalyptic number.

It is an amenable number.

4001729 is a deficient number, since it is larger than the sum of its proper divisors (22291).

4001729 is a wasteful number, since it uses less digits than its factorization.

4001729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22290.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 4001729 is about 2000.4322033001. The cubic root of 4001729 is about 158.7629737057.

The spelling of 4001729 in words is "four million, one thousand, seven hundred twenty-nine".