13809287 has 12 divisors (see below), whose sum is σ = 14898096. Its totient is φ = 12794880.

The previous prime is 13809283. The next prime is 13809293. The reversal of 13809287 is 78290831.

It is not a de Polignac number, because 13809287 - 2² = 13809283 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13809287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13809283) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 20183 + ... + 20855.

It is an arithmetic number, because the mean of its divisors is an integer number (1241508).

Almost surely, 2^13809287 is an apocalyptic number.

13809287 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

13809287 is a deficient number, since it is larger than the sum of its proper divisors (1088809).

13809287 is an equidigital number, since it uses as much as digits as its factorization.

13809287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778 (or 761 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 13809287 is about 3716.0849021517. The cubic root of 13809287 is about 239.9148250995.

The spelling of 13809287 in words is "thirteen million, eight hundred nine thousand, two hundred eighty-seven".