19649216 has 14 divisors (see below), whose sum is σ = 38991540. Its totient is φ = 9824576.

The previous prime is 19649141. The next prime is 19649219. The reversal of 19649216 is 61294691.

It is a self number, because there is not a number n which added to its sum of digits gives 19649216.

It is not an unprimeable number, because it can be changed into a prime (19649219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153446 + ... + 153573.

It is an arithmetic number, because the mean of its divisors is an integer number (2785110).

Almost surely, 2^19649216 is an apocalyptic number.

19649216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19649216 is a deficient number, since it is larger than the sum of its proper divisors (19342324).

19649216 is an equidigital number, since it uses as much as digits as its factorization.

19649216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307031 (or 307021 counting only the distinct ones).

The product of its digits is 23328, while the sum is 38.

The square root of 19649216 is about 4432.7436199266. The cubic root of 19649216 is about 269.8454350825.

The spelling of 19649216 in words is "nineteen million, six hundred forty-nine thousand, two hundred sixteen".