9903813 has 8 divisors (see below), whose sum is σ = 13328928. Its totient is φ = 6540624.

The previous prime is 9903811. The next prime is 9903821. The reversal of 9903813 is 3183099.

9903813 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 9903813 - 2¹ = 9903811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9903811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15106 + ... + 15747.

It is an arithmetic number, because the mean of its divisors is an integer number (1666116).

Almost surely, 2^9903813 is an apocalyptic number.

It is an amenable number.

9903813 is a deficient number, since it is larger than the sum of its proper divisors (3425115).

9903813 is a wasteful number, since it uses less digits than its factorization.

9903813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30963.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 9903813 is about 3147.0324116539. The cubic root of 9903813 is about 214.7504803158.

The spelling of 9903813 in words is "nine million, nine hundred three thousand, eight hundred thirteen".