191840040 has 192 divisors, whose sum is σ = 717724800. Its totient is φ = 43531776.

The previous prime is 191840021. The next prime is 191840063. The reversal of 191840040 is 40048191.

It is a junction number, because it is equal to n+sod(n) for n = 191839986 and 191840013.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 677739 + ... + 678021.

It is an arithmetic number, because the mean of its divisors is an integer number (3738150).

Almost surely, 2^191840040 is an apocalyptic number.

191840040 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 191840040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (358862400).

191840040 is an abundant number, since it is smaller than the sum of its proper divisors (525884760).

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

191840040 is a wasteful number, since it uses less digits than its factorization.

191840040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576 (or 569 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 191840040 is about 13850.6331985220. The cubic root of 191840040 is about 576.7395737210.

The spelling of 191840040 in words is "one hundred ninety-one million, eight hundred forty thousand, forty".