4020729 has 4 divisors (see below), whose sum is σ = 5360976. Its totient is φ = 2680484.

The previous prime is 4020727. The next prime is 4020733. The reversal of 4020729 is 9270204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4020729 - 2¹ = 4020727 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 4020699 and 4020708.

It is not an unprimeable number, because it can be changed into a prime (4020727) 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, 670119 + ... + 670124.

It is an arithmetic number, because the mean of its divisors is an integer number (1340244).

Almost surely, 2^4020729 is an apocalyptic number.

It is an amenable number.

4020729 is a deficient number, since it is larger than the sum of its proper divisors (1340247).

4020729 is a wasteful number, since it uses less digits than its factorization.

4020729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340246.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 4020729 is about 2005.1755534117. The cubic root of 4020729 is about 159.0138431838.

The spelling of 4020729 in words is "four million, twenty thousand, seven hundred twenty-nine".