9420729 has 4 divisors (see below), whose sum is σ = 12560976. Its totient is φ = 6280484.

The previous prime is 9420721. The next prime is 9420743. The reversal of 9420729 is 9270249.

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 9420729 - 2³ = 9420721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9420729.

It is not an unprimeable number, because it can be changed into a prime (9420721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1570119 + ... + 1570124.

It is an arithmetic number, because the mean of its divisors is an integer number (3140244).

Almost surely, 2^9420729 is an apocalyptic number.

It is an amenable number.

9420729 is a deficient number, since it is larger than the sum of its proper divisors (3140247).

9420729 is a wasteful number, since it uses less digits than its factorization.

9420729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3140246.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 9420729 is about 3069.3206088644. The cubic root of 9420729 is about 211.2004489129.

The spelling of 9420729 in words is "nine million, four hundred twenty thousand, seven hundred twenty-nine".