9129729 has 24 divisors (see below), whose sum is σ = 14281920. Its totient is φ = 5172384.

The previous prime is 9129683. The next prime is 9129739. The reversal of 9129729 is 9279219.

It is a happy number.

It is not a de Polignac number, because 9129729 - 2⁸ = 9129473 is a prime.

It is a super-2 number, since 2×9129729² = 166703903226882, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9129739) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25252 + ... + 25610.

It is an arithmetic number, because the mean of its divisors is an integer number (595080).

Almost surely, 2^9129729 is an apocalyptic number.

It is an amenable number.

9129729 is a deficient number, since it is larger than the sum of its proper divisors (5152191).

9129729 is a wasteful number, since it uses less digits than its factorization.

9129729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549 (or 542 counting only the distinct ones).

The product of its digits is 20412, while the sum is 39.

The square root of 9129729 is about 3021.5441416600. The cubic root of 9129729 is about 209.0030523886.

The spelling of 9129729 in words is "nine million, one hundred twenty-nine thousand, seven hundred twenty-nine".