191408 has 20 divisors (see below), whose sum is σ = 424080. Its totient is φ = 81984.

The previous prime is 191353. The next prime is 191413. The reversal of 191408 is 804191.

It is an Ulam number.

It is an unprimeable number.

191408 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 in 3 ways as a sum of consecutive naturals, for example, 743 + ... + 966.

It is an arithmetic number, because the mean of its divisors is an integer number (21204).

2¹⁹¹⁴⁰⁸ is an apocalyptic number.

It is an amenable number.

191408 is an abundant number, since it is smaller than the sum of its proper divisors (232672).

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

191408 is a wasteful number, since it uses less digits than its factorization.

191408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724 (or 1718 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 191408 is about 437.5019999954. The cubic root of 191408 is about 57.6306292859.

Adding to 191408 its reverse (804191), we get a palindrome (995599).

The spelling of 191408 in words is "one hundred ninety-one thousand, four hundred eight".