16717987 has 36 divisors (see below), whose sum is σ = 21858984. Its totient is φ = 12629760.

The previous prime is 16717963. The next prime is 16717991. The reversal of 16717987 is 78971761.

It is not a de Polignac number, because 16717987 - 2²³ = 8329379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16717957) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 726858 + ... + 726880.

It is an arithmetic number, because the mean of its divisors is an integer number (607194).

Almost surely, 2^16717987 is an apocalyptic number.

16717987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

16717987 is a deficient number, since it is larger than the sum of its proper divisors (5140997).

16717987 is a wasteful number, since it uses less digits than its factorization.

16717987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 64 counting only the distinct ones).

The product of its digits is 148176, while the sum is 46.

The square root of 16717987 is about 4088.7635050220. The cubic root of 16717987 is about 255.6983905223.

The spelling of 16717987 in words is "sixteen million, seven hundred seventeen thousand, nine hundred eighty-seven".