11921849 has 8 divisors (see below), whose sum is σ = 12161160. Its totient is φ = 11684736.

The previous prime is 11921827. The next prime is 11921851. The reversal of 11921849 is 94812911.

It can be written as a sum of positive squares in 4 ways, for example, as 5968249 + 5953600 = 2443^2 + 2440^2 .

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 11921849 - 2⁸ = 11921593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11924849) 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, 13967 + ... + 14795.

It is an arithmetic number, because the mean of its divisors is an integer number (1520145).

Almost surely, 2^11921849 is an apocalyptic number.

It is an amenable number.

11921849 is a deficient number, since it is larger than the sum of its proper divisors (239311).

11921849 is an equidigital number, since it uses as much as digits as its factorization.

11921849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099.

The product of its digits is 5184, while the sum is 35.

The square root of 11921849 is about 3452.8030641784. The cubic root of 11921849 is about 228.4447625387. Note that the first 3 decimals are identical.

The spelling of 11921849 in words is "eleven million, nine hundred twenty-one thousand, eight hundred forty-nine".