11981885 has 4 divisors (see below), whose sum is σ = 14378268. Its totient is φ = 9585504.

The previous prime is 11981867. The next prime is 11981891. The reversal of 11981885 is 58818911.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4507129 + 7474756 = 2123^2 + 2734^2 .

It is a cyclic number.

It is not a de Polignac number, because 11981885 - 2¹⁶ = 11916349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1198184 + ... + 1198193.

It is an arithmetic number, because the mean of its divisors is an integer number (3594567).

Almost surely, 2^11981885 is an apocalyptic number.

It is an amenable number.

11981885 is a deficient number, since it is larger than the sum of its proper divisors (2396383).

11981885 is an equidigital number, since it uses as much as digits as its factorization.

11981885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396382.

The product of its digits is 23040, while the sum is 41.

The square root of 11981885 is about 3461.4859525932. The cubic root of 11981885 is about 228.8275877231.

The spelling of 11981885 in words is "eleven million, nine hundred eighty-one thousand, eight hundred eighty-five".