47684639 has 2 divisors, whose sum is σ = 47684640. Its totient is φ = 47684638.

The previous prime is 47684633. The next prime is 47684669. The reversal of 47684639 is 93648674.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 47684639 - 2⁸ = 47684383 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 47684593 and 47684602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47684633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23842319 + 23842320.

It is an arithmetic number, because the mean of its divisors is an integer number (23842320).

Almost surely, 2^47684639 is an apocalyptic number.

47684639 is a deficient number, since it is larger than the sum of its proper divisors (1).

47684639 is an equidigital number, since it uses as much as digits as its factorization.

47684639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 47.

The square root of 47684639 is about 6905.4065050510. The cubic root of 47684639 is about 362.6264678034.

The spelling of 47684639 in words is "forty-seven million, six hundred eighty-four thousand, six hundred thirty-nine".