47309729 has 4 divisors (see below), whose sum is σ = 47751984. Its totient is φ = 46867476.

The previous prime is 47309723. The next prime is 47309737. The reversal of 47309729 is 92790374.

47309729 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.

It is a cyclic number.

It is not a de Polignac number, because 47309729 - 2⁸ = 47309473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47309723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220967 + ... + 221180.

It is an arithmetic number, because the mean of its divisors is an integer number (11937996).

Almost surely, 2^47309729 is an apocalyptic number.

It is an amenable number.

47309729 is a deficient number, since it is larger than the sum of its proper divisors (442255).

47309729 is a wasteful number, since it uses less digits than its factorization.

47309729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442254.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 47309729 is about 6878.2068157333. The cubic root of 47309729 is about 361.6736092258.

The spelling of 47309729 in words is "forty-seven million, three hundred nine thousand, seven hundred twenty-nine".