194991028 has 12 divisors (see below), whose sum is σ = 347673060. Its totient is φ = 95655872.

The previous prime is 194991019. The next prime is 194991029. The reversal of 194991028 is 820199491.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 169468324 + 25522704 = 13018^2 + 5052^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194991029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 459673 + ... + 460096.

It is an arithmetic number, because the mean of its divisors is an integer number (28972755).

Almost surely, 2^194991028 is an apocalyptic number.

It is an amenable number.

194991028 is a deficient number, since it is larger than the sum of its proper divisors (152682032).

194991028 is a wasteful number, since it uses less digits than its factorization.

194991028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919826 (or 919824 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 43.

The square root of 194991028 is about 13963.9187909412. The cubic root of 194991028 is about 579.8801060146.

The spelling of 194991028 in words is "one hundred ninety-four million, nine hundred ninety-one thousand, twenty-eight".