13553985 has 16 divisors (see below), whose sum is σ = 22216320. Its totient is φ = 7052160.

The previous prime is 13553959. The next prime is 13553989. The reversal of 13553985 is 58935531.

It is a happy number.

It is not a de Polignac number, because 13553985 - 2⁷ = 13553857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13553989) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 10405 + ... + 11634.

It is an arithmetic number, because the mean of its divisors is an integer number (1388520).

Almost surely, 2^13553985 is an apocalyptic number.

13553985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13553985 is a deficient number, since it is larger than the sum of its proper divisors (8662335).

13553985 is a wasteful number, since it uses less digits than its factorization.

13553985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22088.

The product of its digits is 81000, while the sum is 39.

The square root of 13553985 is about 3681.5737124224. The cubic root of 13553985 is about 238.4271276823.

The spelling of 13553985 in words is "thirteen million, five hundred fifty-three thousand, nine hundred eighty-five".