1009903 has 4 divisors (see below), whose sum is σ = 1027080. Its totient is φ = 992728.

The previous prime is 1009901. The next prime is 1009909. The reversal of 1009903 is 3099001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3099001 = 193 ⋅16057.

It is a cyclic number.

It is not a de Polignac number, because 1009903 - 2¹ = 1009901 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1009901) 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, 8500 + ... + 8617.

It is an arithmetic number, because the mean of its divisors is an integer number (256770).

2^1009903 is an apocalyptic number.

1009903 is a deficient number, since it is larger than the sum of its proper divisors (17177).

1009903 is an equidigital number, since it uses as much as digits as its factorization.

1009903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17176.

The product of its (nonzero) digits is 243, while the sum is 22.

The square root of 1009903 is about 1004.9393016496. The cubic root of 1009903 is about 100.3290162956.

The spelling of 1009903 in words is "one million, nine thousand, nine hundred three".