84039947 has 2 divisors, whose sum is σ = 84039948. Its totient is φ = 84039946.

The previous prime is 84039937. The next prime is 84039971. The reversal of 84039947 is 74993048.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84039947 - 2¹⁶ = 83974411 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 84039898 and 84039907.

It is not a weakly prime, because it can be changed into another prime (84039937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42019973 + 42019974.

It is an arithmetic number, because the mean of its divisors is an integer number (42019974).

Almost surely, 2^84039947 is an apocalyptic number.

84039947 is a deficient number, since it is larger than the sum of its proper divisors (1).

84039947 is an equidigital number, since it uses as much as digits as its factorization.

84039947 is an evil number, because the sum of its binary digits is even.

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

The square root of 84039947 is about 9167.3304183934. The cubic root of 84039947 is about 438.0213270545.

The spelling of 84039947 in words is "eighty-four million, thirty-nine thousand, nine hundred forty-seven".