13888887 has 4 divisors (see below), whose sum is σ = 18518520. Its totient is φ = 9259256.

The previous prime is 13888879. The next prime is 13888933. The reversal of 13888887 is 78888831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13888887 - 2³ = 13888879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13888817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2314812 + ... + 2314817.

It is an arithmetic number, because the mean of its divisors is an integer number (4629630).

Almost surely, 2^13888887 is an apocalyptic number.

13888887 is a deficient number, since it is larger than the sum of its proper divisors (4629633).

13888887 is an equidigital number, since it uses as much as digits as its factorization.

13888887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4629632.

The product of its digits is 688128, while the sum is 51.

The square root of 13888887 is about 3726.7797090786. The cubic root of 13888887 is about 240.3749174876.

The spelling of 13888887 in words is "thirteen million, eight hundred eighty-eight thousand, eight hundred eighty-seven".