13987987 has 8 divisors (see below), whose sum is σ = 15174320. Its totient is φ = 12817440.

The previous prime is 13987969. The next prime is 13987997. The reversal of 13987987 is 78978931.

13987987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 13987987 - 2¹⁵ = 13955219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13987997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2064 + ... + 5677.

It is an arithmetic number, because the mean of its divisors is an integer number (1896790).

Almost surely, 2^13987987 is an apocalyptic number.

13987987 is a deficient number, since it is larger than the sum of its proper divisors (1186333).

13987987 is a wasteful number, since it uses less digits than its factorization.

13987987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7893.

The product of its digits is 762048, while the sum is 52.

The square root of 13987987 is about 3740.0517376101. The cubic root of 13987987 is about 240.9452708836.

The spelling of 13987987 in words is "thirteen million, nine hundred eighty-seven thousand, nine hundred eighty-seven".