13987605 has 16 divisors (see below), whose sum is σ = 22748544. Its totient is φ = 7337280.

The previous prime is 13987579. The next prime is 13987613. The reversal of 13987605 is 50678931.

It is not a de Polignac number, because 13987605 - 2⁵ = 13987573 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6729 + ... + 8558.

It is an arithmetic number, because the mean of its divisors is an integer number (1421784).

Almost surely, 2^13987605 is an apocalyptic number.

13987605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13987605 is a deficient number, since it is larger than the sum of its proper divisors (8760939).

13987605 is a wasteful number, since it uses less digits than its factorization.

13987605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15356.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 13987605 is about 3740.0006684491. Note that the first 3 decimals coincide. The cubic root of 13987605 is about 240.9430775270.

The spelling of 13987605 in words is "thirteen million, nine hundred eighty-seven thousand, six hundred five".