304868138 has 8 divisors (see below), whose sum is σ = 459624132. Its totient is φ = 151660096.

The previous prime is 304868131. The next prime is 304868143. The reversal of 304868138 is 831868403.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 302168689 + 2699449 = 17383^2 + 1643^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 304868095 and 304868104.

It is not an unprimeable number, because it can be changed into a prime (304868131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386495 + ... + 387282.

Almost surely, 2^304868138 is an apocalyptic number.

304868138 is a deficient number, since it is larger than the sum of its proper divisors (154755994).

304868138 is a wasteful number, since it uses less digits than its factorization.

304868138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773976.

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 304868138 is about 17460.4735903698. The cubic root of 304868138 is about 673.0345297627.

The spelling of 304868138 in words is "three hundred four million, eight hundred sixty-eight thousand, one hundred thirty-eight".