11747981 has 16 divisors (see below), whose sum is σ = 14015616. Its totient is φ = 9637056.

The previous prime is 11747971. The next prime is 11748031. The reversal of 11747981 is 18974711.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11747981 - 2¹⁰ = 11746957 is a prime.

It is a super-2 number, since 2×11747981² = 276030115152722, 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 (11747921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17015 + ... + 17691.

It is an arithmetic number, because the mean of its divisors is an integer number (875976).

Almost surely, 2^11747981 is an apocalyptic number.

It is an amenable number.

11747981 is a deficient number, since it is larger than the sum of its proper divisors (2267635).

11747981 is an equidigital number, since it uses as much as digits as its factorization.

11747981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788.

The product of its digits is 14112, while the sum is 38.

The square root of 11747981 is about 3427.5327861306. The cubic root of 11747981 is about 227.3287750787.

The spelling of 11747981 in words is "eleven million, seven hundred forty-seven thousand, nine hundred eighty-one".