11826991 has 8 divisors (see below), whose sum is σ = 13463424. Its totient is φ = 10284120.

The previous prime is 11826979. The next prime is 11827001. The reversal of 11826991 is 19962811.

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

It is not a de Polignac number, because 11826991 - 2⁵ = 11826959 is a prime.

It is a super-2 number, since 2×11826991² = 279755432228162, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11826991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11826931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23121 + ... + 23626.

It is an arithmetic number, because the mean of its divisors is an integer number (1682928).

Almost surely, 2^11826991 is an apocalyptic number.

11826991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11826991 is a deficient number, since it is larger than the sum of its proper divisors (1636433).

11826991 is a wasteful number, since it uses less digits than its factorization.

11826991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46781.

The product of its digits is 7776, while the sum is 37.

The square root of 11826991 is about 3439.0392553735. The cubic root of 11826991 is about 227.8372633232.

The spelling of 11826991 in words is "eleven million, eight hundred twenty-six thousand, nine hundred ninety-one".