47709909 has 48 divisors (see below), whose sum is σ = 77680512. Its totient is φ = 28024704.

The previous prime is 47709881. The next prime is 47709923. The reversal of 47709909 is 90990774.

It is not a de Polignac number, because 47709909 - 2⁵ = 47709877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47709989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 445834 + ... + 445940.

It is an arithmetic number, because the mean of its divisors is an integer number (1618344).

Almost surely, 2^47709909 is an apocalyptic number.

It is an amenable number.

47709909 is a deficient number, since it is larger than the sum of its proper divisors (29970603).

47709909 is a wasteful number, since it uses less digits than its factorization.

47709909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 263 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The square root of 47709909 is about 6907.2359884399. The cubic root of 47709909 is about 362.6905132542.

The spelling of 47709909 in words is "forty-seven million, seven hundred nine thousand, nine hundred nine".