13987311 has 32 divisors (see below), whose sum is σ = 21631680. Its totient is φ = 7990272.

The previous prime is 13987301. The next prime is 13987313. The reversal of 13987311 is 11378931.

It is not a de Polignac number, because 13987311 - 2¹¹ = 13985263 is a prime.

It is a super-5 number, since 5×13987311⁵ (a number of 37 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13987313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 191571 + ... + 191643.

It is an arithmetic number, because the mean of its divisors is an integer number (675990).

Almost surely, 2^13987311 is an apocalyptic number.

13987311 is a deficient number, since it is larger than the sum of its proper divisors (7644369).

13987311 is an equidigital number, since it uses as much as digits as its factorization.

13987311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140 (or 106 counting only the distinct ones).

The product of its digits is 4536, while the sum is 33.

The square root of 13987311 is about 3739.9613634368. The cubic root of 13987311 is about 240.9413894191.

The spelling of 13987311 in words is "thirteen million, nine hundred eighty-seven thousand, three hundred eleven".