11921903 has 8 divisors (see below), whose sum is σ = 13716480. Its totient is φ = 10150200.

The previous prime is 11921867. The next prime is 11921933. The reversal of 11921903 is 30912911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11921903 - 2¹⁸ = 11659759 is a prime.

It is a super-2 number, since 2×11921903² = 284263542282818, 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 (11921933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4583 + ... + 6696.

It is an arithmetic number, because the mean of its divisors is an integer number (1714560).

Almost surely, 2^11921903 is an apocalyptic number.

11921903 is a deficient number, since it is larger than the sum of its proper divisors (1794577).

11921903 is a wasteful number, since it uses less digits than its factorization.

11921903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11437.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 11921903 is about 3452.8108839031. The cubic root of 11921903 is about 228.4451074516.

It can be divided in two parts, 119 and 21903, that added together give a palindrome (22022).

The spelling of 11921903 in words is "eleven million, nine hundred twenty-one thousand, nine hundred three".