12691980 has 108 divisors (see below), whose sum is σ = 44815680. Its totient is φ = 2899008.

The previous prime is 12691957. The next prime is 12691997. The reversal of 12691980 is 8919621.

It is a super-2 number, since 2×12691980² = 322172712640800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8101 + ... + 9539.

It is an arithmetic number, because the mean of its divisors is an integer number (414960).

Almost surely, 2^12691980 is an apocalyptic number.

12691980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12691980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22407840).

12691980 is an abundant number, since it is smaller than the sum of its proper divisors (32123700).

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

12691980 is a wasteful number, since it uses less digits than its factorization.

12691980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468 (or 1456 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 12691980 is about 3562.5805254057. The cubic root of 12691980 is about 233.2615334640.

It can be divided in two parts, 1269 and 1980, that added together give a square (3249 = 57²).

The spelling of 12691980 in words is "twelve million, six hundred ninety-one thousand, nine hundred eighty".