999903403 has 4 divisors (see below), whose sum is σ = 1043377488. Its totient is φ = 956429320.

The previous prime is 999903391. The next prime is 999903473. The reversal of 999903403 is 304309999.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999903403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999903473) 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, 21737008 + ... + 21737053.

It is an arithmetic number, because the mean of its divisors is an integer number (260844372).

Almost surely, 2^999903403 is an apocalyptic number.

999903403 is a deficient number, since it is larger than the sum of its proper divisors (43474085).

999903403 is a wasteful number, since it uses less digits than its factorization.

999903403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43474084.

The product of its (nonzero) digits is 236196, while the sum is 46.

The square root of 999903403 is about 31621.2492321224. The cubic root of 999903403 is about 999.9677999632.

The spelling of 999903403 in words is "nine hundred ninety-nine million, nine hundred three thousand, four hundred three".