191019873240 has 480 divisors, whose sum is σ = 779348861280. Its totient is φ = 41762552832.

The previous prime is 191019873211. The next prime is 191019873277. The reversal of 191019873240 is 42378910191.

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 (23) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 3625324 + ... + 3677636.

It is an arithmetic number, because the mean of its divisors is an integer number (1623643461).

Almost surely, 2^191019873240 is an apocalyptic number.

191019873240 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 191019873240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (389674430640).

191019873240 is an abundant number, since it is smaller than the sum of its proper divisors (588328988040).

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

191019873240 is a wasteful number, since it uses less digits than its factorization.

191019873240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52373 (or 52353 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The spelling of 191019873240 in words is "one hundred ninety-one billion, nineteen million, eight hundred seventy-three thousand, two hundred forty".