16440318 has 24 divisors (see below), whose sum is σ = 36380448. Its totient is φ = 5363232.

The previous prime is 16440313. The next prime is 16440329. The reversal of 16440318 is 81304461.

16440318 is a `hidden beast` number, since 1 + 644 + 0 + 3 + 18 = 666.

It is a super-3 number, since 3×16440318³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16440291 and 16440300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16440311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8871 + ... + 10562.

It is an arithmetic number, because the mean of its divisors is an integer number (1515852).

Almost surely, 2^16440318 is an apocalyptic number.

16440318 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16440318 is an abundant number, since it is smaller than the sum of its proper divisors (19940130).

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

16440318 is a wasteful number, since it uses less digits than its factorization.

16440318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19488 (or 19485 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 16440318 is about 4054.6662008111. Note that the first 3 decimals coincide. The cubic root of 16440318 is about 254.2748487010.

Adding to 16440318 its reverse (81304461), we get a palindrome (97744779).

The spelling of 16440318 in words is "sixteen million, four hundred forty thousand, three hundred eighteen".