6399903 has 8 divisors (see below), whose sum is σ = 8982400. Its totient is φ = 4042008.

The previous prime is 6399889. The next prime is 6399917. The reversal of 6399903 is 3099936.

It is an interprime number because it is at equal distance from previous prime (6399889) and next prime (6399917).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6399903 - 2⁹ = 6399391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6395903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56083 + ... + 56196.

It is an arithmetic number, because the mean of its divisors is an integer number (1122800).

Almost surely, 2^6399903 is an apocalyptic number.

6399903 is a deficient number, since it is larger than the sum of its proper divisors (2582497).

6399903 is a wasteful number, since it uses less digits than its factorization.

6399903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112301.

The product of its (nonzero) digits is 39366, while the sum is 39.

The square root of 6399903 is about 2529.8029567537. The cubic root of 6399903 is about 185.6626153520.

The spelling of 6399903 in words is "six million, three hundred ninety-nine thousand, nine hundred three".