19138728 has 32 divisors (see below), whose sum is σ = 54682560. Its totient is φ = 5468160.

The previous prime is 19138711. The next prime is 19138733. The reversal of 19138728 is 82783191.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56793 + ... + 57128.

It is an arithmetic number, because the mean of its divisors is an integer number (1708830).

Almost surely, 2^19138728 is an apocalyptic number.

It is an amenable number.

19138728 is an abundant number, since it is smaller than the sum of its proper divisors (35543832).

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

19138728 is a wasteful number, since it uses less digits than its factorization.

19138728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113937 (or 113933 counting only the distinct ones).

The product of its digits is 24192, while the sum is 39.

The square root of 19138728 is about 4374.7831946280. The cubic root of 19138728 is about 267.4880327718.

The spelling of 19138728 in words is "nineteen million, one hundred thirty-eight thousand, seven hundred twenty-eight".