11980665 has 24 divisors (see below), whose sum is σ = 21989448. Its totient is φ = 6013440.

The previous prime is 11980613. The next prime is 11980669. The reversal of 11980665 is 56608911.

It can be written as a sum of positive squares in 4 ways, for example, as 6335289 + 5645376 = 2517^2 + 2376^2 .

It is not a de Polignac number, because 11980665 - 2⁷ = 11980537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11980669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7066 + ... + 8595.

It is an arithmetic number, because the mean of its divisors is an integer number (916227).

Almost surely, 2^11980665 is an apocalyptic number.

11980665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11980665 is a deficient number, since it is larger than the sum of its proper divisors (10008783).

11980665 is a wasteful number, since it uses less digits than its factorization.

11980665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15689 (or 15686 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 11980665 is about 3461.3097232117. The cubic root of 11980665 is about 228.8198210228.

The spelling of 11980665 in words is "eleven million, nine hundred eighty thousand, six hundred sixty-five".