13965987 has 8 divisors (see below), whose sum is σ = 21281536. Its totient is φ = 7980552.

The previous prime is 13965967. The next prime is 13965989. The reversal of 13965987 is 78956931.

13965987 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 not a de Polignac number, because 13965987 - 2⁷ = 13965859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13965989) 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, 332503 + ... + 332544.

It is an arithmetic number, because the mean of its divisors is an integer number (2660192).

Almost surely, 2^13965987 is an apocalyptic number.

13965987 is a deficient number, since it is larger than the sum of its proper divisors (7315549).

13965987 is an equidigital number, since it uses as much as digits as its factorization.

13965987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665057.

The product of its digits is 408240, while the sum is 48.

The square root of 13965987 is about 3737.1094444771. The cubic root of 13965987 is about 240.8188867851.

The spelling of 13965987 in words is "thirteen million, nine hundred sixty-five thousand, nine hundred eighty-seven".