47908909 has 4 divisors (see below), whose sum is σ = 48042720. Its totient is φ = 47775100.

The previous prime is 47908901. The next prime is 47908921. The reversal of 47908909 is 90980974.

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 47908909 - 2³ = 47908901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47908901) 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, 66367 + ... + 67084.

It is an arithmetic number, because the mean of its divisors is an integer number (12010680).

Almost surely, 2^47908909 is an apocalyptic number.

It is an amenable number.

47908909 is a deficient number, since it is larger than the sum of its proper divisors (133811).

47908909 is a wasteful number, since it uses less digits than its factorization.

47908909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133810.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 47908909 is about 6921.6261817582. The cubic root of 47908909 is about 363.1940794711.

The spelling of 47908909 in words is "forty-seven million, nine hundred eight thousand, nine hundred nine".