6440099 has 2 divisors, whose sum is σ = 6440100. Its totient is φ = 6440098.

The previous prime is 6440089. The next prime is 6440113. The reversal of 6440099 is 9900446.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6440099 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6440029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220049 + 3220050.

It is an arithmetic number, because the mean of its divisors is an integer number (3220050).

Almost surely, 2^6440099 is an apocalyptic number.

6440099 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440099 is an equidigital number, since it uses as much as digits as its factorization.

6440099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 6440099 is about 2537.7350137475. The cubic root of 6440099 is about 186.0505027236.

The spelling of 6440099 in words is "six million, four hundred forty thousand, ninety-nine".