13661985 has 8 divisors (see below), whose sum is σ = 21859200. Its totient is φ = 7286384.

The previous prime is 13661971. The next prime is 13662013. The reversal of 13661985 is 58916631.

13661985 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13661985 - 2⁵ = 13661953 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455385 + ... + 455414.

It is an arithmetic number, because the mean of its divisors is an integer number (2732400).

Almost surely, 2^13661985 is an apocalyptic number.

13661985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13661985 is a deficient number, since it is larger than the sum of its proper divisors (8197215).

13661985 is an equidigital number, since it uses as much as digits as its factorization.

13661985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910807.

The product of its digits is 38880, while the sum is 39.

The square root of 13661985 is about 3696.2122503990. The cubic root of 13661985 is about 239.0587263704.

The spelling of 13661985 in words is "thirteen million, six hundred sixty-one thousand, nine hundred eighty-five".