191880140 has 24 divisors (see below), whose sum is σ = 410553360. Its totient is φ = 75303488.

The previous prime is 191880119. The next prime is 191880151. The reversal of 191880140 is 41088191.

It is a junction number, because it is equal to n+sod(n) for n = 191880097 and 191880106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89450 + ... + 91569.

It is an arithmetic number, because the mean of its divisors is an integer number (17106390).

Almost surely, 2^191880140 is an apocalyptic number.

191880140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191880140 is an abundant number, since it is smaller than the sum of its proper divisors (218673220).

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

191880140 is a wasteful number, since it uses less digits than its factorization.

191880140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181081 (or 181079 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 191880140 is about 13852.0807101316. The cubic root of 191880140 is about 576.7797558881.

The spelling of 191880140 in words is "one hundred ninety-one million, eight hundred eighty thousand, one hundred forty".