11989903 has 4 divisors (see below), whose sum is σ = 11997288. Its totient is φ = 11982520.

The previous prime is 11989897. The next prime is 11989919. The reversal of 11989903 is 30998911.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11989903 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 (11989973) 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, 76 + ... + 4897.

It is an arithmetic number, because the mean of its divisors is an integer number (2999322).

Almost surely, 2^11989903 is an apocalyptic number.

11989903 is a deficient number, since it is larger than the sum of its proper divisors (7385).

11989903 is an equidigital number, since it uses as much as digits as its factorization.

11989903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7384.

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 11989903 is about 3462.6439320265. The cubic root of 11989903 is about 228.8786183830.

The spelling of 11989903 in words is "eleven million, nine hundred eighty-nine thousand, nine hundred three".