47909839 has 2 divisors, whose sum is σ = 47909840. Its totient is φ = 47909838.

The previous prime is 47909837. The next prime is 47909843. The reversal of 47909839 is 93890974.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 47909839 - 2¹ = 47909837 is a prime.

Together with 47909837, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 47909792 and 47909801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47909831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23954919 + 23954920.

It is an arithmetic number, because the mean of its divisors is an integer number (23954920).

Almost surely, 2^47909839 is an apocalyptic number.

47909839 is a deficient number, since it is larger than the sum of its proper divisors (1).

47909839 is an equidigital number, since it uses as much as digits as its factorization.

47909839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 47909839 is about 6921.6933621766. The cubic root of 47909839 is about 363.1964295442.

The spelling of 47909839 in words is "forty-seven million, nine hundred nine thousand, eight hundred thirty-nine".