29985729 has 4 divisors (see below), whose sum is σ = 39980976. Its totient is φ = 19990484.

The previous prime is 29985701. The next prime is 29985733. The reversal of 29985729 is 92758992.

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 a de Polignac number, because none of the positive numbers 2^k-29985729 is a prime.

It is a super-2 number, since 2×29985729² = 1798287887322882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (29985829) 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, 4997619 + ... + 4997624.

It is an arithmetic number, because the mean of its divisors is an integer number (9995244).

Almost surely, 2^29985729 is an apocalyptic number.

It is an amenable number.

29985729 is a deficient number, since it is larger than the sum of its proper divisors (9995247).

29985729 is an equidigital number, since it uses as much as digits as its factorization.

29985729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9995246.

The product of its digits is 816480, while the sum is 51.

The square root of 29985729 is about 5475.9226619813. The cubic root of 29985729 is about 310.6739724306.

The spelling of 29985729 in words is "twenty-nine million, nine hundred eighty-five thousand, seven hundred twenty-nine".