4091903 has 4 divisors (see below), whose sum is σ = 4096248. Its totient is φ = 4087560.

The previous prime is 4091873. The next prime is 4091909. The reversal of 4091903 is 3091904.

It is a happy number.

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 not a de Polignac number, because 4091903 - 2¹² = 4087807 is a prime.

It is a super-2 number, since 2×4091903² = 33487340322818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4091909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101 + ... + 2862.

It is an arithmetic number, because the mean of its divisors is an integer number (1024062).

Almost surely, 2^4091903 is an apocalyptic number.

4091903 is a deficient number, since it is larger than the sum of its proper divisors (4345).

4091903 is a wasteful number, since it uses less digits than its factorization.

4091903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4344.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 4091903 is about 2022.8452733711. The cubic root of 4091903 is about 159.9466358495.

Subtracting from 4091903 its reverse (3091904), we obtain a palindrome (999999).

It can be divided in two parts, 4091 and 903, that added together give a palindrome (4994).

The spelling of 4091903 in words is "four million, ninety-one thousand, nine hundred three".