8423999989 has 2 divisors, whose sum is σ = 8423999990. Its totient is φ = 8423999988.

The previous prime is 8423999971. The next prime is 8424000061. The reversal of 8423999989 is 9899993248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6813181764 + 1610818225 = 82542^2 + 40135^2 .

It is a cyclic number.

It is not a de Polignac number, because 8423999989 - 2⁵ = 8423999957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8423999959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4211999994 + 4211999995.

It is an arithmetic number, because the mean of its divisors is an integer number (4211999995).

Almost surely, 2^8423999989 is an apocalyptic number.

It is an amenable number.

8423999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

8423999989 is an equidigital number, since it uses as much as digits as its factorization.

8423999989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90699264, while the sum is 70.

The square root of 8423999989 is about 91782.3511847458. The cubic root of 8423999989 is about 2034.7268649229.

The spelling of 8423999989 in words is "eight billion, four hundred twenty-three million, nine hundred ninety-nine thousand, nine hundred eighty-nine".