13555865 has 8 divisors (see below), whose sum is σ = 16291968. Its totient is φ = 10828080.

The previous prime is 13555859. The next prime is 13555877. The reversal of 13555865 is 56855531.

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

It is not a de Polignac number, because 13555865 - 2¹⁶ = 13490329 is a prime.

It is a super-2 number, since 2×13555865² = 367522951796450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2384 + ... + 5726.

It is an arithmetic number, because the mean of its divisors is an integer number (2036496).

Almost surely, 2^13555865 is an apocalyptic number.

It is an amenable number.

13555865 is a deficient number, since it is larger than the sum of its proper divisors (2736103).

13555865 is an equidigital number, since it uses as much as digits as its factorization.

13555865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4159.

The product of its digits is 90000, while the sum is 38.

The square root of 13555865 is about 3681.8290291647. The cubic root of 13555865 is about 238.4381508187.

The spelling of 13555865 in words is "thirteen million, five hundred fifty-five thousand, eight hundred sixty-five".