19195323840 has 1344 divisors, whose sum is σ = 88471004160. Its totient is φ = 3832012800.

The previous prime is 19195323827. The next prime is 19195323859. The reversal of 19195323840 is 4832359191.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (1344).

It is a Harshad number since it is a multiple of its sum of digits (45).

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 191 ways as a sum of consecutive naturals, for example, 314677410 + ... + 314677470.

It is an arithmetic number, because the mean of its divisors is an integer number (65826640).

Almost surely, 2^19195323840 is an apocalyptic number.

19195323840 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 19195323840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44235502080).

19195323840 is an abundant number, since it is smaller than the sum of its proper divisors (69275680320).

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

19195323840 is a wasteful number, since it uses less digits than its factorization.

19195323840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 19195323840 in words is "nineteen billion, one hundred ninety-five million, three hundred twenty-three thousand, eight hundred forty".