191908 has 6 divisors (see below), whose sum is σ = 335846. Its totient is φ = 95952.

The previous prime is 191903. The next prime is 191911. The reversal of 191908 is 809191.

It can be written as a sum of positive squares in only one way, i.e., 191844 + 64 = 438^2 + 8^2 .

It is a plaindrome in base 15.

It is a nialpdrome in base 9.

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

191908 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23985 + ... + 23992.

2¹⁹¹⁹⁰⁸ is an apocalyptic number.

It is an amenable number.

191908 is a deficient number, since it is larger than the sum of its proper divisors (143938).

191908 is a wasteful number, since it uses less digits than its factorization.

191908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47981 (or 47979 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 191908 is about 438.0730532685. The cubic root of 191908 is about 57.6807669679.

The spelling of 191908 in words is "one hundred ninety-one thousand, nine hundred eight".