191997700 has 36 divisors (see below), whose sum is σ = 419226640. Its totient is φ = 76321440.

The previous prime is 191997613. The next prime is 191997713. The reversal of 191997700 is 7799191.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10411 + ... + 22189.

Almost surely, 2^191997700 is an apocalyptic number.

191997700 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 191997700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209613320).

191997700 is an abundant number, since it is smaller than the sum of its proper divisors (227228940).

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

191997700 is a wasteful number, since it uses less digits than its factorization.

191997700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11956 (or 11949 counting only the distinct ones).

The product of its (nonzero) digits is 35721, while the sum is 43.

The square root of 191997700 is about 13856.3234662013. The cubic root of 191997700 is about 576.8975245207.

The spelling of 191997700 in words is "one hundred ninety-one million, nine hundred ninety-seven thousand, seven hundred".