13631987 has 8 divisors (see below), whose sum is σ = 14398800. Its totient is φ = 12870144.

The previous prime is 13631983. The next prime is 13631993. The reversal of 13631987 is 78913631.

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

It is not a de Polignac number, because 13631987 - 2² = 13631983 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 13631987.

It is not an unprimeable number, because it can be changed into a prime (13631983) 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, 5339 + ... + 7467.

It is an arithmetic number, because the mean of its divisors is an integer number (1799850).

Almost surely, 2^13631987 is an apocalyptic number.

13631987 is a deficient number, since it is larger than the sum of its proper divisors (766813).

13631987 is a wasteful number, since it uses less digits than its factorization.

13631987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2485.

The product of its digits is 27216, while the sum is 38.

The square root of 13631987 is about 3692.1520824581. The cubic root of 13631987 is about 238.8836288568.

It can be divided in two parts, 136 and 31987, that added together give a palindrome (32123).

The spelling of 13631987 in words is "thirteen million, six hundred thirty-one thousand, nine hundred eighty-seven".