16818444 has 36 divisors (see below), whose sum is σ = 42831880. Its totient is φ = 5564160.

The previous prime is 16818443. The next prime is 16818449. The reversal of 16818444 is 44481861.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×16818444² = 565720117162272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 16818399 and 16818408.

It is not an unprimeable number, because it can be changed into a prime (16818443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3324 + ... + 6684.

Almost surely, 2^16818444 is an apocalyptic number.

It is an amenable number.

16818444 is an abundant number, since it is smaller than the sum of its proper divisors (26013436).

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

16818444 is a wasteful number, since it uses less digits than its factorization.

16818444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3510 (or 3505 counting only the distinct ones).

The product of its digits is 24576, while the sum is 36.

The square root of 16818444 is about 4101.0296268132. The cubic root of 16818444 is about 256.2095249180.

The spelling of 16818444 in words is "sixteen million, eight hundred eighteen thousand, four hundred forty-four".