16217887 has 16 divisors (see below), whose sum is σ = 19840000. Its totient is φ = 12947040.

The previous prime is 16217869. The next prime is 16217893. The reversal of 16217887 is 78871261.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16217887 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13 and base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16217807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7114 + ... + 9112.

It is an arithmetic number, because the mean of its divisors is an integer number (1240000).

Almost surely, 2^16217887 is an apocalyptic number.

16217887 is a deficient number, since it is larger than the sum of its proper divisors (3622113).

16217887 is a wasteful number, since it uses less digits than its factorization.

16217887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2086.

The product of its digits is 37632, while the sum is 40.

The square root of 16217887 is about 4027.1437769218. The cubic root of 16217887 is about 253.1228917571.

The spelling of 16217887 in words is "sixteen million, two hundred seventeen thousand, eight hundred eighty-seven".