19091072 has 128 divisors (see below), whose sum is σ = 51408000. Its totient is φ = 6819840.

The previous prime is 19091057. The next prime is 19091089. The reversal of 19091072 is 27019091.

It is a tau number, because it is divible by the number of its divisors (128).

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128054 + ... + 128202.

It is an arithmetic number, because the mean of its divisors is an integer number (401625).

Almost surely, 2^19091072 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 19091072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25704000).

19091072 is an abundant number, since it is smaller than the sum of its proper divisors (32316928).

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

19091072 is a wasteful number, since it uses less digits than its factorization.

19091072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 19091072 is about 4369.3331298952. Note that the first 3 decimals coincide. The cubic root of 19091072 is about 267.2658305295.

The spelling of 19091072 in words is "nineteen million, ninety-one thousand, seventy-two".