19428916 has 36 divisors (see below), whose sum is σ = 37769004. Its totient is φ = 8736000.

The previous prime is 19428901. The next prime is 19428917. The reversal of 19428916 is 61982491.

It can be written as a sum of positive squares in 6 ways, for example, as 3984016 + 15444900 = 1996^2 + 3930^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19428917) 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 11 ways as a sum of consecutive naturals, for example, 27366 + ... + 28066.

It is an arithmetic number, because the mean of its divisors is an integer number (1049139).

Almost surely, 2^19428916 is an apocalyptic number.

It is an amenable number.

19428916 is a deficient number, since it is larger than the sum of its proper divisors (18340088).

19428916 is a wasteful number, since it uses less digits than its factorization.

19428916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772 (or 757 counting only the distinct ones).

The product of its digits is 31104, while the sum is 40.

The square root of 19428916 is about 4407.8244066659. The cubic root of 19428916 is about 268.8331723103.

The spelling of 19428916 in words is "nineteen million, four hundred twenty-eight thousand, nine hundred sixteen".