11981612 has 12 divisors (see below), whose sum is σ = 21102480. Its totient is φ = 5952336.

The previous prime is 11981603. The next prime is 11981623. The reversal of 11981612 is 21618911.

It is a super-2 number, since 2×11981612² = 287118052237088, which contains 22 as substring.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 8912 + ... + 10167.

It is an arithmetic number, because the mean of its divisors is an integer number (1758540).

Almost surely, 2^11981612 is an apocalyptic number.

It is an amenable number.

11981612 is a deficient number, since it is larger than the sum of its proper divisors (9120868).

11981612 is a wasteful number, since it uses less digits than its factorization.

11981612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19240 (or 19238 counting only the distinct ones).

The product of its digits is 864, while the sum is 29.

The square root of 11981612 is about 3461.4465184371. The cubic root of 11981612 is about 228.8258498106.

The spelling of 11981612 in words is "eleven million, nine hundred eighty-one thousand, six hundred twelve".