19172216 has 64 divisors (see below), whose sum is σ = 44505600. Its totient is φ = 7558272.

The previous prime is 19172213. The next prime is 19172233. The reversal of 19172216 is 61227191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19172213) 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 in 15 ways as a sum of consecutive naturals, for example, 39125 + ... + 39611.

It is an arithmetic number, because the mean of its divisors is an integer number (695400).

Almost surely, 2^19172216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19172216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22252800).

19172216 is an abundant number, since it is smaller than the sum of its proper divisors (25333384).

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

19172216 is a wasteful number, since it uses less digits than its factorization.

19172216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556 (or 552 counting only the distinct ones).

The product of its digits is 1512, while the sum is 29.

The square root of 19172216 is about 4378.6089115152. The cubic root of 19172216 is about 267.6439543107.

The spelling of 19172216 in words is "nineteen million, one hundred seventy-two thousand, two hundred sixteen".