19289340 has 180 divisors, whose sum is σ = 70680456. Its totient is φ = 4408992.

The previous prime is 19289329. The next prime is 19289353. The reversal of 19289340 is 4398291.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 19289295 and 19289304.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 2755617 + ... + 2755623.

Almost surely, 2^19289340 is an apocalyptic number.

19289340 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 19289340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35340228).

19289340 is an abundant number, since it is smaller than the sum of its proper divisors (51391116).

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

19289340 is an frugal number, since it uses more digits than its factorization.

19289340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50 (or 17 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 19289340 is about 4391.9631145992. The cubic root of 19289340 is about 268.1878648624.

The spelling of 19289340 in words is "nineteen million, two hundred eighty-nine thousand, three hundred forty".