29947340809 has 3 divisors (see below), whose sum is σ = 29947513863. Its totient is φ = 29947167756.

The previous prime is 29947340803. The next prime is 29947340833. The reversal of 29947340809 is 90804374992.

The square root of 29947340809 is 173053.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 22546524025 + 7400816784 = 150155^2 + 86028^2 .

It is not a de Polignac number, because 29947340809 - 2⁷ = 29947340681 is a prime.

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 29947340809.

It is not an unprimeable number, because it can be changed into a prime (29947340803) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 86527 + ... + 259579.

It is an arithmetic number, because the mean of its divisors is an integer number (9982504621).

Almost surely, 2^29947340809 is an apocalyptic number.

29947340809 is the 173053-rd square number.

29947340809 is the 86527-th centered octagonal number.

It is an amenable number.

29947340809 is a deficient number, since it is larger than the sum of its proper divisors (173054).

29947340809 is an frugal number, since it uses more digits than its factorization.

29947340809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346106 (or 173053 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 55.

The spelling of 29947340809 in words is "twenty-nine billion, nine hundred forty-seven million, three hundred forty thousand, eight hundred nine".