194728321 has 8 divisors (see below), whose sum is σ = 205106400. Its totient is φ = 184363200.

The previous prime is 194728309. The next prime is 194728333. The reversal of 194728321 is 123827491.

It is an interprime number because it is at equal distance from previous prime (194728309) and next prime (194728333).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 194728321 - 2¹⁹ = 194204033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194728021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51390 + ... + 55048.

It is an arithmetic number, because the mean of its divisors is an integer number (25638300).

Almost surely, 2^194728321 is an apocalyptic number.

It is an amenable number.

194728321 is a deficient number, since it is larger than the sum of its proper divisors (10378079).

194728321 is a wasteful number, since it uses less digits than its factorization.

194728321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6479.

The product of its digits is 24192, while the sum is 37.

The square root of 194728321 is about 13954.5089845541. The cubic root of 194728321 is about 579.6195691925.

The spelling of 194728321 in words is "one hundred ninety-four million, seven hundred twenty-eight thousand, three hundred twenty-one".