191900 has 36 divisors (see below), whose sum is σ = 442680. Its totient is φ = 72000.

The previous prime is 191899. The next prime is 191903. The reversal of 191900 is 9191.

It is a super-2 number, since 2×191900² = 73651220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1850 + ... + 1950.

2¹⁹¹⁹⁰⁰ is an apocalyptic number.

191900 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 191900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221340).

191900 is an abundant number, since it is smaller than the sum of its proper divisors (250780).

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

191900 is a wasteful number, since it uses less digits than its factorization.

191900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 191900 is about 438.0639222762. The cubic root of 191900 is about 57.6799654510.

It can be divided in two parts, 19 and 1900, that multiplied together give a square (36100 = 190²).

The spelling of 191900 in words is "one hundred ninety-one thousand, nine hundred".