84678947 has 2 divisors, whose sum is σ = 84678948. Its totient is φ = 84678946.

The previous prime is 84678941. The next prime is 84678959. The reversal of 84678947 is 74987648.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84678947 - 2⁶ = 84678883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84678941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42339473 + 42339474.

It is an arithmetic number, because the mean of its divisors is an integer number (42339474).

Almost surely, 2^84678947 is an apocalyptic number.

84678947 is a deficient number, since it is larger than the sum of its proper divisors (1).

84678947 is an equidigital number, since it uses as much as digits as its factorization.

84678947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2709504, while the sum is 53.

The square root of 84678947 is about 9202.1164413411. The cubic root of 84678947 is about 439.1286941321.

The spelling of 84678947 in words is "eighty-four million, six hundred seventy-eight thousand, nine hundred forty-seven".