11997660 has 24 divisors (see below), whose sum is σ = 33593616. Its totient is φ = 3199360.

The previous prime is 11997659. The next prime is 11997679. The reversal of 11997660 is 6679911.

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 7 ways as a sum of consecutive naturals, for example, 99921 + ... + 100040.

It is an arithmetic number, because the mean of its divisors is an integer number (1399734).

Almost surely, 2^11997660 is an apocalyptic number.

11997660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11997660 is an abundant number, since it is smaller than the sum of its proper divisors (21595956).

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

11997660 is a wasteful number, since it uses less digits than its factorization.

11997660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199973 (or 199971 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 11997660 is about 3463.7638487634. The cubic root of 11997660 is about 228.9279662581.

It can be divided in two parts, 119 and 97660, that added together give a palindrome (97779).

The spelling of 11997660 in words is "eleven million, nine hundred ninety-seven thousand, six hundred sixty".