84869999 has 2 divisors, whose sum is σ = 84870000. Its totient is φ = 84869998.

The previous prime is 84869987. The next prime is 84870007. The reversal of 84869999 is 99996848.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84869999 is a prime.

It is a Chen prime.

84869999 is a modest number, since divided by 9999 gives 8486 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84869969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42434999 + 42435000.

It is an arithmetic number, because the mean of its divisors is an integer number (42435000).

Almost surely, 2^84869999 is an apocalyptic number.

84869999 is a deficient number, since it is larger than the sum of its proper divisors (1).

84869999 is an equidigital number, since it uses as much as digits as its factorization.

84869999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10077696, while the sum is 62.

The square root of 84869999 is about 9212.4914653963. The cubic root of 84869999 is about 439.4586990181.

The spelling of 84869999 in words is "eighty-four million, eight hundred sixty-nine thousand, nine hundred ninety-nine".