13643985 has 8 divisors (see below), whose sum is σ = 21830400. Its totient is φ = 7276784.

The previous prime is 13643977. The next prime is 13644017. The reversal of 13643985 is 58934631.

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 13643985 - 2³ = 13643977 is a prime.

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, 454785 + ... + 454814.

It is an arithmetic number, because the mean of its divisors is an integer number (2728800).

Almost surely, 2^13643985 is an apocalyptic number.

13643985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13643985 is a deficient number, since it is larger than the sum of its proper divisors (8186415).

13643985 is an equidigital number, since it uses as much as digits as its factorization.

13643985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909607.

The product of its digits is 77760, while the sum is 39.

The square root of 13643985 is about 3693.7765227474. The cubic root of 13643985 is about 238.9536916518.

The spelling of 13643985 in words is "thirteen million, six hundred forty-three thousand, nine hundred eighty-five".