6899989 has 2 divisors, whose sum is σ = 6899990. Its totient is φ = 6899988.

The previous prime is 6899969. The next prime is 6900001. The reversal of 6899989 is 9899986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4774225 + 2125764 = 2185^2 + 1458^2 .

It is a cyclic number.

It is not a de Polignac number, because 6899989 - 2¹⁵ = 6867221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6899969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3449994 + 3449995.

It is an arithmetic number, because the mean of its divisors is an integer number (3449995).

Almost surely, 2^6899989 is an apocalyptic number.

It is an amenable number.

6899989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6899989 is an equidigital number, since it uses as much as digits as its factorization.

6899989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 58.

The square root of 6899989 is about 2626.7830134977. The cubic root of 6899989 is about 190.3777250293.

The spelling of 6899989 in words is "six million, eight hundred ninety-nine thousand, nine hundred eighty-nine".