16718985 has 24 divisors (see below), whose sum is σ = 29140800. Its totient is φ = 8867232.

The previous prime is 16718983. The next prime is 16718987. The reversal of 16718985 is 58981761.

It is an interprime number because it is at equal distance from previous prime (16718983) and next prime (16718987).

It is not a de Polignac number, because 16718985 - 2¹ = 16718983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 16718985.

It is not an unprimeable number, because it can be changed into a prime (16718983) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8022 + ... + 9888.

It is an arithmetic number, because the mean of its divisors is an integer number (1214200).

Almost surely, 2^16718985 is an apocalyptic number.

16718985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16718985 is a deficient number, since it is larger than the sum of its proper divisors (12421815).

16718985 is a wasteful number, since it uses less digits than its factorization.

16718985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2077 (or 2074 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 16718985 is about 4088.8855449866. The cubic root of 16718985 is about 255.7034784936.

The spelling of 16718985 in words is "sixteen million, seven hundred eighteen thousand, nine hundred eighty-five".