16000003 has 4 divisors (see below), whose sum is σ = 16023280. Its totient is φ = 15976728.

The previous prime is 15999989. The next prime is 16000057. The reversal of 16000003 is 30000061.

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

It is a cyclic number.

It is not a de Polignac number, because 16000003 - 2⁹ = 15999491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16000403) 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, 10575 + ... + 11992.

It is an arithmetic number, because the mean of its divisors is an integer number (4005820).

Almost surely, 2^16000003 is an apocalyptic number.

16000003 is a deficient number, since it is larger than the sum of its proper divisors (23277).

16000003 is an equidigital number, since it uses as much as digits as its factorization.

16000003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23276.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 16000003 is about 4000.0003750000. Note that the first 3 decimals coincide. The cubic root of 16000003 is about 251.9842257280.

Adding to 16000003 its reverse (30000061), we get a palindrome (46000064).

The spelling of 16000003 in words is "sixteen million, three", and thus it is an aban number and an uban number.