6399203903 has 4 divisors (see below), whose sum is σ = 6775627680. Its totient is φ = 6022780128.

The previous prime is 6399203891. The next prime is 6399203917. The reversal of 6399203903 is 3093029936.

It is a happy number.

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

It is not a de Polignac number, because 6399203903 - 2²⁸ = 6130768447 is a prime.

It is a super-3 number, since 3×6399203903³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6399200903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188211863 + ... + 188211896.

It is an arithmetic number, because the mean of its divisors is an integer number (1693906920).

Almost surely, 2^6399203903 is an apocalyptic number.

6399203903 is a deficient number, since it is larger than the sum of its proper divisors (376423777).

6399203903 is a wasteful number, since it uses less digits than its factorization.

6399203903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376423776.

The product of its (nonzero) digits is 236196, while the sum is 44.

The square root of 6399203903 is about 79995.0242390113. The cubic root of 6399203903 is about 1856.5585478582.

The spelling of 6399203903 in words is "six billion, three hundred ninety-nine million, two hundred three thousand, nine hundred three".