13661980 has 24 divisors (see below), whose sum is σ = 28789488. Its totient is φ = 5445888.

The previous prime is 13661971. The next prime is 13662013. The reversal of 13661980 is 8916631.

13661980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5727 + ... + 7753.

It is an arithmetic number, because the mean of its divisors is an integer number (1199562).

Almost surely, 2^13661980 is an apocalyptic number.

13661980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13661980 is an abundant number, since it is smaller than the sum of its proper divisors (15127508).

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

13661980 is a wasteful number, since it uses less digits than its factorization.

13661980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2373 (or 2371 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 13661980 is about 3696.2115740309. The cubic root of 13661980 is about 239.0586972069.

It can be divided in two parts, 13661 and 980, that added together give a palindrome (14641).

The spelling of 13661980 in words is "thirteen million, six hundred sixty-one thousand, nine hundred eighty".