191297140 has 48 divisors (see below), whose sum is σ = 411505920. Its totient is φ = 74672000.

The previous prime is 191297123. The next prime is 191297143. The reversal of 191297140 is 41792191.

It is a junction number, because it is equal to n+sod(n) for n = 191297096 and 191297105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191297143) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 265701 + ... + 266419.

It is an arithmetic number, because the mean of its divisors is an integer number (8573040).

Almost surely, 2^191297140 is an apocalyptic number.

191297140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191297140 is an abundant number, since it is smaller than the sum of its proper divisors (220208780).

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

191297140 is a wasteful number, since it uses less digits than its factorization.

191297140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032 (or 1030 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 191297140 is about 13831.0209312256. The cubic root of 191297140 is about 576.1950093628.

The spelling of 191297140 in words is "one hundred ninety-one million, two hundred ninety-seven thousand, one hundred forty".