13509855 has 64 divisors (see below), whose sum is σ = 26496000. Its totient is φ = 6500736.

The previous prime is 13509833. The next prime is 13509857. The reversal of 13509855 is 55890531.

It is a happy number.

13509855 is nontrivially palindromic in base 7.

It is not a de Polignac number, because 13509855 - 2⁵ = 13509823 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a zygodrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13509857) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 58881 + ... + 59109.

It is an arithmetic number, because the mean of its divisors is an integer number (414000).

Almost surely, 2^13509855 is an apocalyptic number.

13509855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13509855 is a deficient number, since it is larger than the sum of its proper divisors (12986145).

13509855 is a wasteful number, since it uses less digits than its factorization.

13509855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 13509855 is about 3675.5754651483. The cubic root of 13509855 is about 238.1680838406.

The spelling of 13509855 in words is "thirteen million, five hundred nine thousand, eight hundred fifty-five".