11981930 has 32 divisors (see below), whose sum is σ = 22636800. Its totient is φ = 4560192.

The previous prime is 11981929. The next prime is 11981941. The reversal of 11981930 is 3918911.

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 in 15 ways as a sum of consecutive naturals, for example, 22649 + ... + 23171.

It is an arithmetic number, because the mean of its divisors is an integer number (707400).

Almost surely, 2^11981930 is an apocalyptic number.

11981930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11981930 is a deficient number, since it is larger than the sum of its proper divisors (10654870).

11981930 is a wasteful number, since it uses less digits than its factorization.

11981930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 11981930 is about 3461.4924526857. The cubic root of 11981930 is about 228.8278741897.

The spelling of 11981930 in words is "eleven million, nine hundred eighty-one thousand, nine hundred thirty".