47809439 has 8 divisors (see below), whose sum is σ = 49206960. Its totient is φ = 46417536.

The previous prime is 47809427. The next prime is 47809451. The reversal of 47809439 is 93490874.

It is an interprime number because it is at equal distance from previous prime (47809427) and next prime (47809451).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 47809439 - 2²⁴ = 31032223 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 47809439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47809039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20852 + ... + 23030.

It is an arithmetic number, because the mean of its divisors is an integer number (6150870).

Almost surely, 2^47809439 is an apocalyptic number.

47809439 is a deficient number, since it is larger than the sum of its proper divisors (1397521).

47809439 is a wasteful number, since it uses less digits than its factorization.

47809439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2809.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 47809439 is about 6914.4369980498. The cubic root of 47809439 is about 362.9425469459.

The spelling of 47809439 in words is "forty-seven million, eight hundred nine thousand, four hundred thirty-nine".