16809018 has 16 divisors (see below), whose sum is σ = 33842496. Its totient is φ = 5565600.

The previous prime is 16809017. The next prime is 16809019. The reversal of 16809018 is 81090861.

It is an interprime number because it is at equal distance from previous prime (16809017) and next prime (16809019).

It is a super-2 number, since 2×16809018² = 565086172248648, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16809018.

It is not an unprimeable number, because it can be changed into a prime (16809011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8371 + ... + 10182.

It is an arithmetic number, because the mean of its divisors is an integer number (2115156).

Almost surely, 2^16809018 is an apocalyptic number.

16809018 is an abundant number, since it is smaller than the sum of its proper divisors (17033478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16809018 is a wasteful number, since it uses less digits than its factorization.

16809018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18709.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 16809018 is about 4099.8802421534. The cubic root of 16809018 is about 256.1616512404.

Adding to 16809018 its reverse (81090861), we get a palindrome (97899879).

The spelling of 16809018 in words is "sixteen million, eight hundred nine thousand, eighteen".