13669987 has 8 divisors (see below), whose sum is σ = 14436560. Its totient is φ = 12944016.

The previous prime is 13669979. The next prime is 13669993. The reversal of 13669987 is 78996631.

It is not a de Polignac number, because 13669987 - 2³ = 13669979 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 13669987.

It is not an unprimeable number, because it can be changed into a prime (13669927) 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 7 ways as a sum of consecutive naturals, for example, 5863 + ... + 7855.

It is an arithmetic number, because the mean of its divisors is an integer number (1804570).

Almost surely, 2^13669987 is an apocalyptic number.

13669987 is a deficient number, since it is larger than the sum of its proper divisors (766573).

13669987 is an frugal number, since it uses more digits than its factorization.

13669987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050 (or 2012 counting only the distinct ones).

The product of its digits is 489888, while the sum is 49.

The square root of 13669987 is about 3697.2945514254. The cubic root of 13669987 is about 239.1053905160.

The spelling of 13669987 in words is "thirteen million, six hundred sixty-nine thousand, nine hundred eighty-seven".