9220729 has 4 divisors (see below), whose sum is σ = 10537984. Its totient is φ = 7903476.

The previous prime is 9220721. The next prime is 9220751. The reversal of 9220729 is 9270229.

9220729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9270229 = 197 ⋅47057.

It is not a de Polignac number, because 9220729 - 2³ = 9220721 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9220729.

It is not an unprimeable number, because it can be changed into a prime (9220721) 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, 658617 + ... + 658630.

It is an arithmetic number, because the mean of its divisors is an integer number (2634496).

Almost surely, 2^9220729 is an apocalyptic number.

It is an amenable number.

9220729 is a deficient number, since it is larger than the sum of its proper divisors (1317255).

9220729 is a wasteful number, since it uses less digits than its factorization.

9220729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317254.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 9220729 is about 3036.5653294471. The cubic root of 9220729 is about 209.6951661861.

The spelling of 9220729 in words is "nine million, two hundred twenty thousand, seven hundred twenty-nine".