13685775 has 24 divisors (see below), whose sum is σ = 22748544. Its totient is φ = 7260000.

The previous prime is 13685773. The next prime is 13685783. The reversal of 13685775 is 57758631.

It is not a de Polignac number, because 13685775 - 2¹ = 13685773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13685773) 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 23 ways as a sum of consecutive naturals, for example, 18462 + ... + 19188.

It is an arithmetic number, because the mean of its divisors is an integer number (947856).

Almost surely, 2^13685775 is an apocalyptic number.

13685775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13685775 is a deficient number, since it is larger than the sum of its proper divisors (9062769).

13685775 is a wasteful number, since it uses less digits than its factorization.

13685775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991 (or 986 counting only the distinct ones).

The product of its digits is 176400, while the sum is 42.

The square root of 13685775 is about 3699.4290099960. The cubic root of 13685775 is about 239.1974058081.

The spelling of 13685775 in words is "thirteen million, six hundred eighty-five thousand, seven hundred seventy-five".