4000729 has 4 divisors (see below), whose sum is σ = 4236084. Its totient is φ = 3765376.

The previous prime is 4000723. The next prime is 4000741. The reversal of 4000729 is 9270004.

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 3069504 + 931225 = 1752^2 + 965^2 .

It is a cyclic number.

It is not a de Polignac number, because 4000729 - 2¹⁵ = 3967961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4000723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117652 + ... + 117685.

It is an arithmetic number, because the mean of its divisors is an integer number (1059021).

Almost surely, 2^4000729 is an apocalyptic number.

It is an amenable number.

4000729 is a deficient number, since it is larger than the sum of its proper divisors (235355).

4000729 is a wasteful number, since it uses less digits than its factorization.

4000729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235354.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 4000729 is about 2000.1822416970. The cubic root of 4000729 is about 158.7497480724.

The spelling of 4000729 in words is "four million, seven hundred twenty-nine", and thus it is an aban number.