191958940 has 24 divisors (see below), whose sum is σ = 408219840. Its totient is φ = 75811008.

The previous prime is 191958931. The next prime is 191958941. The reversal of 191958940 is 49859191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191958941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59167 + ... + 62326.

It is an arithmetic number, because the mean of its divisors is an integer number (17009160).

Almost surely, 2^191958940 is an apocalyptic number.

191958940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191958940 is an abundant number, since it is smaller than the sum of its proper divisors (216260900).

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

191958940 is a wasteful number, since it uses less digits than its factorization.

191958940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121581 (or 121579 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 46.

The square root of 191958940 is about 13854.9247562013. The cubic root of 191958940 is about 576.8587010471.

The spelling of 191958940 in words is "one hundred ninety-one million, nine hundred fifty-eight thousand, nine hundred forty".