47308809 has 4 divisors (see below), whose sum is σ = 63078416. Its totient is φ = 31539204.

The previous prime is 47308801. The next prime is 47308813. The reversal of 47308809 is 90880374.

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 not a de Polignac number, because 47308809 - 2³ = 47308801 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (47308801) 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, 7884799 + ... + 7884804.

It is an arithmetic number, because the mean of its divisors is an integer number (15769604).

Almost surely, 2^47308809 is an apocalyptic number.

It is an amenable number.

47308809 is a deficient number, since it is larger than the sum of its proper divisors (15769607).

47308809 is a wasteful number, since it uses less digits than its factorization.

47308809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15769606.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 47308809 is about 6878.1399375122. The cubic root of 47308809 is about 361.6712648041.

The spelling of 47308809 in words is "forty-seven million, three hundred eight thousand, eight hundred nine".