90009903 has 4 divisors (see below), whose sum is σ = 120013208. Its totient is φ = 60006600.

The previous prime is 90009901. The next prime is 90009919. The reversal of 90009903 is 30990009.

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

It is not a de Polignac number, because 90009903 - 2¹ = 90009901 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 (90009901) 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, 15001648 + ... + 15001653.

It is an arithmetic number, because the mean of its divisors is an integer number (30003302).

Almost surely, 2^90009903 is an apocalyptic number.

90009903 is a deficient number, since it is larger than the sum of its proper divisors (30003305).

90009903 is a wasteful number, since it uses less digits than its factorization.

90009903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30003304.

The product of its (nonzero) digits is 2187, while the sum is 30.

The square root of 90009903 is about 9487.3549000762. The cubic root of 90009903 is about 448.1569108496.

The spelling of 90009903 in words is "ninety million, nine thousand, nine hundred three".