84145847 has 2 divisors, whose sum is σ = 84145848. Its totient is φ = 84145846.

The previous prime is 84145819. The next prime is 84145861. The reversal of 84145847 is 74854148.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84145847 - 2¹⁸ = 83883703 is a prime.

It is a super-3 number, since 3×84145847³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84144847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42072923 + 42072924.

It is an arithmetic number, because the mean of its divisors is an integer number (42072924).

Almost surely, 2^84145847 is an apocalyptic number.

84145847 is a deficient number, since it is larger than the sum of its proper divisors (1).

84145847 is an equidigital number, since it uses as much as digits as its factorization.

84145847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 143360, while the sum is 41.

The square root of 84145847 is about 9173.1045453543. The cubic root of 84145847 is about 438.2052355795.

The spelling of 84145847 in words is "eighty-four million, one hundred forty-five thousand, eight hundred forty-seven".