84986789 has 2 divisors, whose sum is σ = 84986790. Its totient is φ = 84986788.

The previous prime is 84986773. The next prime is 84986813. The reversal of 84986789 is 98768948.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53436100 + 31550689 = 7310^2 + 5617^2 .

It is a cyclic number.

It is not a de Polignac number, because 84986789 - 2⁴ = 84986773 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84986389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42493394 + 42493395.

It is an arithmetic number, because the mean of its divisors is an integer number (42493395).

Almost surely, 2^84986789 is an apocalyptic number.

It is an amenable number.

84986789 is a deficient number, since it is larger than the sum of its proper divisors (1).

84986789 is an equidigital number, since it uses as much as digits as its factorization.

84986789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6967296, while the sum is 59.

The square root of 84986789 is about 9218.8279623822. The cubic root of 84986789 is about 439.6601870094.

The spelling of 84986789 in words is "eighty-four million, nine hundred eighty-six thousand, seven hundred eighty-nine".