16388887 has 4 divisors (see below), whose sum is σ = 17251480. Its totient is φ = 15526296.

The previous prime is 16388881. The next prime is 16388893. The reversal of 16388887 is 78888361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78888361 = 19 ⋅4152019.

It is an interprime number because it is at equal distance from previous prime (16388881) and next prime (16388893).

It is a cyclic number.

It is not a de Polignac number, because 16388887 - 2¹⁹ = 15864599 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 16388887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16388881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431268 + ... + 431305.

It is an arithmetic number, because the mean of its divisors is an integer number (4312870).

Almost surely, 2^16388887 is an apocalyptic number.

16388887 is a deficient number, since it is larger than the sum of its proper divisors (862593).

16388887 is an equidigital number, since it uses as much as digits as its factorization.

16388887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862592.

The product of its digits is 516096, while the sum is 49.

The square root of 16388887 is about 4048.3190338707. The cubic root of 16388887 is about 254.0094185029.

The spelling of 16388887 in words is "sixteen million, three hundred eighty-eight thousand, eight hundred eighty-seven".