47840239 has 2 divisors, whose sum is σ = 47840240. Its totient is φ = 47840238.

The previous prime is 47840237. The next prime is 47840249. The reversal of 47840239 is 93204874.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 47840239 - 2¹ = 47840237 is a prime.

Together with 47840237, it forms a pair of twin primes.

It is equal to p_2879128 and since 47840239 and 2879128 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 47840198 and 47840207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47840231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23920119 + 23920120.

It is an arithmetic number, because the mean of its divisors is an integer number (23920120).

Almost surely, 2^47840239 is an apocalyptic number.

47840239 is a deficient number, since it is larger than the sum of its proper divisors (1).

47840239 is an equidigital number, since it uses as much as digits as its factorization.

47840239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 47840239 is about 6916.6638634532. The cubic root of 47840239 is about 363.0204690120.

The spelling of 47840239 in words is "forty-seven million, eight hundred forty thousand, two hundred thirty-nine".