16818985 has 16 divisors (see below), whose sum is σ = 21021840. Its totient is φ = 12902400.

The previous prime is 16818983. The next prime is 16819013. The reversal of 16818985 is 58981861.

It can be written as a sum of positive squares in 8 ways, for example, as 784 + 16818201 = 28^2 + 4101^2 .

It is not a de Polignac number, because 16818985 - 2¹ = 16818983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16818983) 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, 27685 + ... + 28285.

It is an arithmetic number, because the mean of its divisors is an integer number (1313865).

Almost surely, 2^16818985 is an apocalyptic number.

It is an amenable number.

16818985 is a deficient number, since it is larger than the sum of its proper divisors (4202855).

16818985 is a wasteful number, since it uses less digits than its factorization.

16818985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828.

The product of its digits is 138240, while the sum is 46.

The square root of 16818985 is about 4101.0955853284. The cubic root of 16818985 is about 256.2122720581.

The spelling of 16818985 in words is "sixteen million, eight hundred eighteen thousand, nine hundred eighty-five".