6400299 has 4 divisors (see below), whose sum is σ = 8533736. Its totient is φ = 4266864.

The previous prime is 6400259. The next prime is 6400349. The reversal of 6400299 is 9920046.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6400299 - 2¹⁵ = 6367531 is a prime.

It is a D-number.

It is a Duffinian number.

6400299 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6400259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1066714 + ... + 1066719.

It is an arithmetic number, because the mean of its divisors is an integer number (2133434).

Almost surely, 2^6400299 is an apocalyptic number.

6400299 is a deficient number, since it is larger than the sum of its proper divisors (2133437).

6400299 is a wasteful number, since it uses less digits than its factorization.

6400299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133436.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 6400299 is about 2529.8812225083. The cubic root of 6400299 is about 185.6664446225. Note that the first 3 decimals are identical.

The spelling of 6400299 in words is "six million, four hundred thousand, two hundred ninety-nine".