191428 has 6 divisors (see below), whose sum is σ = 335006. Its totient is φ = 95712.

The previous prime is 191413. The next prime is 191441. The reversal of 191428 is 824191.

It is a happy number.

191428 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 166464 + 24964 = 408^2 + 158^2 .

It is an unprimeable number.

191428 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, 23925 + ... + 23932.

2¹⁹¹⁴²⁸ is an apocalyptic number.

It is an amenable number.

191428 is a deficient number, since it is larger than the sum of its proper divisors (143578).

191428 is a wasteful number, since it uses less digits than its factorization.

191428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47861 (or 47859 counting only the distinct ones).

The product of its digits is 576, while the sum is 25.

The square root of 191428 is about 437.5248564368. The cubic root of 191428 is about 57.6326364685.

The spelling of 191428 in words is "one hundred ninety-one thousand, four hundred twenty-eight".