11921917 has 8 divisors (see below), whose sum is σ = 13730112. Its totient is φ = 10140000.

The previous prime is 11921867. The next prime is 11921933. The reversal of 11921917 is 71912911.

It is a happy number.

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 11921917 - 2¹⁹ = 11397629 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 (11921957) 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, 5584 + ... + 7417.

It is an arithmetic number, because the mean of its divisors is an integer number (1716264).

Almost surely, 2^11921917 is an apocalyptic number.

It is an amenable number.

11921917 is a deficient number, since it is larger than the sum of its proper divisors (1808195).

11921917 is a wasteful number, since it uses less digits than its factorization.

11921917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13139.

The product of its digits is 1134, while the sum is 31.

The square root of 11921917 is about 3452.8129112363. The cubic root of 11921917 is about 228.4451968733.

The spelling of 11921917 in words is "eleven million, nine hundred twenty-one thousand, nine hundred seventeen".