16319987 has 4 divisors (see below), whose sum is σ = 16333680. Its totient is φ = 16306296.

The previous prime is 16319977. The next prime is 16319999. The reversal of 16319987 is 78991361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78991361 = 23 ⋅3434407.

It is a cyclic number.

It is not a de Polignac number, because 16319987 - 2⁴ = 16319971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16319977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4868 + ... + 7505.

It is an arithmetic number, because the mean of its divisors is an integer number (4083420).

Almost surely, 2^16319987 is an apocalyptic number.

16319987 is a deficient number, since it is larger than the sum of its proper divisors (13693).

16319987 is a wasteful number, since it uses less digits than its factorization.

16319987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13692.

The product of its digits is 81648, while the sum is 44.

The square root of 16319987 is about 4039.8003663548. The cubic root of 16319987 is about 253.6529608647.

The spelling of 16319987 in words is "sixteen million, three hundred nineteen thousand, nine hundred eighty-seven".