11981706 has 32 divisors (see below), whose sum is σ = 26265600. Its totient is φ = 3613680.

The previous prime is 11981701. The next prime is 11981707. The reversal of 11981706 is 60718911.

It is a super-2 number, since 2×11981706² = 287122557340872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11981701) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 24775 + ... + 25253.

It is an arithmetic number, because the mean of its divisors is an integer number (820800).

Almost surely, 2^11981706 is an apocalyptic number.

11981706 is an abundant number, since it is smaller than the sum of its proper divisors (14283894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11981706 is a wasteful number, since it uses less digits than its factorization.

11981706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874.

The product of its (nonzero) digits is 3024, while the sum is 33.

The square root of 11981706 is about 3461.4600965489. The cubic root of 11981706 is about 228.8264482157.

The spelling of 11981706 in words is "eleven million, nine hundred eighty-one thousand, seven hundred six".