13987187 has 8 divisors (see below), whose sum is σ = 14312640. Its totient is φ = 13665600.

The previous prime is 13987139. The next prime is 13987217. The reversal of 13987187 is 78178931.

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 13987187 - 2¹⁰ = 13986163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13987087) 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, 7103 + ... + 8855.

It is an arithmetic number, because the mean of its divisors is an integer number (1789080).

Almost surely, 2^13987187 is an apocalyptic number.

13987187 is a deficient number, since it is larger than the sum of its proper divisors (325453).

13987187 is a wasteful number, since it uses less digits than its factorization.

13987187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933.

The product of its digits is 84672, while the sum is 44.

The square root of 13987187 is about 3739.9447856887. The cubic root of 13987187 is about 240.9406774209.

The spelling of 13987187 in words is "thirteen million, nine hundred eighty-seven thousand, one hundred eighty-seven".