11883981 has 4 divisors (see below), whose sum is σ = 15845312. Its totient is φ = 7922652.

The previous prime is 11883979. The next prime is 11883983. The reversal of 11883981 is 18938811.

11883981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18938811 = 3 ⋅6312937.

It is an interprime number because it is at equal distance from previous prime (11883979) and next prime (11883983).

It is not a de Polignac number, because 11883981 - 2¹ = 11883979 is a prime.

It is a super-2 number, since 2×11883981² = 282458008816722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11883983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1980661 + ... + 1980666.

It is an arithmetic number, because the mean of its divisors is an integer number (3961328).

Almost surely, 2^11883981 is an apocalyptic number.

It is an amenable number.

11883981 is a deficient number, since it is larger than the sum of its proper divisors (3961331).

11883981 is an equidigital number, since it uses as much as digits as its factorization.

11883981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3961330.

The product of its digits is 13824, while the sum is 39.

The square root of 11883981 is about 3447.3150421741. The cubic root of 11883981 is about 228.2026322635.

The spelling of 11883981 in words is "eleven million, eight hundred eighty-three thousand, nine hundred eighty-one".