19193369840 has 80 divisors (see below), whose sum is σ = 47127400320. Its totient is φ = 7249409280.

The previous prime is 19193369753. The next prime is 19193369851. The reversal of 19193369840 is 4896339191.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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, 446075 + ... + 487205.

It is an arithmetic number, because the mean of its divisors is an integer number (589092504).

Almost surely, 2^19193369840 is an apocalyptic number.

19193369840 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 19193369840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23563700160).

19193369840 is an abundant number, since it is smaller than the sum of its proper divisors (27934030480).

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

19193369840 is a wasteful number, since it uses less digits than its factorization.

19193369840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41470 (or 41464 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 53.

The spelling of 19193369840 in words is "nineteen billion, one hundred ninety-three million, three hundred sixty-nine thousand, eight hundred forty".