6400099 has 2 divisors, whose sum is σ = 6400100. Its totient is φ = 6400098.

The previous prime is 6400091. The next prime is 6400117. The reversal of 6400099 is 9900046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6400099 - 2³ = 6400091 is a prime.

It is a super-2 number, since 2×6400099² = 81922534419602, which contains 22 as substring.

It is a Chen prime.

6400099 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6400091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200049 + 3200050.

It is an arithmetic number, because the mean of its divisors is an integer number (3200050).

Almost surely, 2^6400099 is an apocalyptic number.

6400099 is a deficient number, since it is larger than the sum of its proper divisors (1).

6400099 is an equidigital number, since it uses as much as digits as its factorization.

6400099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 6400099 is about 2529.8416946521. The cubic root of 6400099 is about 185.6645106673.

The spelling of 6400099 in words is "six million, four hundred thousand, ninety-nine".