19440216 has 32 divisors (see below), whose sum is σ = 54001200. Its totient is φ = 6480000.

The previous prime is 19440203. The next prime is 19440217. The reversal of 19440216 is 61204491.

19440216 is a `hidden beast` number, since 1 + 9 + 440 + 216 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 19440216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19440217) 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, 44785 + ... + 45216.

Almost surely, 2^19440216 is an apocalyptic number.

It is an amenable number.

19440216 is an abundant number, since it is smaller than the sum of its proper divisors (34560984).

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

19440216 is a wasteful number, since it uses less digits than its factorization.

19440216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90016 (or 90006 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 19440216 is about 4409.1060318391. The cubic root of 19440216 is about 268.8852806575.

The spelling of 19440216 in words is "nineteen million, four hundred forty thousand, two hundred sixteen".