11981560 has 16 divisors (see below), whose sum is σ = 26958600. Its totient is φ = 4792608.

The previous prime is 11981443. The next prime is 11981587. The reversal of 11981560 is 6518911.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149730 + ... + 149809.

Almost surely, 2^11981560 is an apocalyptic number.

11981560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11981560 is an abundant number, since it is smaller than the sum of its proper divisors (14977040).

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

11981560 is a wasteful number, since it uses less digits than its factorization.

11981560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299550 (or 299546 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 11981560 is about 3461.4390071183. The cubic root of 11981560 is about 228.8255187766.

The spelling of 11981560 in words is "eleven million, nine hundred eighty-one thousand, five hundred sixty".