84689447 has 2 divisors, whose sum is σ = 84689448. Its totient is φ = 84689446.

The previous prime is 84689431. The next prime is 84689453. The reversal of 84689447 is 74498648.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84689447 - 2⁴ = 84689431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 84689395 and 84689404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84689147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42344723 + 42344724.

It is an arithmetic number, because the mean of its divisors is an integer number (42344724).

Almost surely, 2^84689447 is an apocalyptic number.

84689447 is a deficient number, since it is larger than the sum of its proper divisors (1).

84689447 is an equidigital number, since it uses as much as digits as its factorization.

84689447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1548288, while the sum is 50.

The square root of 84689447 is about 9202.6869445831. The cubic root of 84689447 is about 439.1468437072.

The spelling of 84689447 in words is "eighty-four million, six hundred eighty-nine thousand, four hundred forty-seven".