19091040 has 96 divisors (see below), whose sum is σ = 62125056. Its totient is φ = 4922880.

The previous prime is 19090999. The next prime is 19091057. The reversal of 19091040 is 4019091.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 19091040.

It is a congruent number.

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, 14239 + ... + 15521.

It is an arithmetic number, because the mean of its divisors is an integer number (647136).

Almost surely, 2^19091040 is an apocalyptic number.

19091040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19091040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31062528).

19091040 is an abundant number, since it is smaller than the sum of its proper divisors (43034016).

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

19091040 is a wasteful number, since it uses less digits than its factorization.

19091040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332 (or 1324 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 19091040 is about 4369.3294680076. The cubic root of 19091040 is about 267.2656812012.

The spelling of 19091040 in words is "nineteen million, ninety-one thousand, forty".