11821982 has 4 divisors (see below), whose sum is σ = 17732976. Its totient is φ = 5910990.

The previous prime is 11821969. The next prime is 11821991. The reversal of 11821982 is 28912811.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2955494 + ... + 2955497.

It is an arithmetic number, because the mean of its divisors is an integer number (4433244).

Almost surely, 2^11821982 is an apocalyptic number.

11821982 is a deficient number, since it is larger than the sum of its proper divisors (5910994).

11821982 is an equidigital number, since it uses as much as digits as its factorization.

11821982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5910993.

The product of its digits is 2304, while the sum is 32.

The square root of 11821982 is about 3438.3109225316. The cubic root of 11821982 is about 227.8050940250.

The spelling of 11821982 in words is "eleven million, eight hundred twenty-one thousand, nine hundred eighty-two".