305909138 has 8 divisors (see below), whose sum is σ = 469535088. Its totient is φ = 149397444.

The previous prime is 305909137. The next prime is 305909141. The reversal of 305909138 is 831909503.

305909138 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (305909137) 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, 1778456 + ... + 1778627.

It is an arithmetic number, because the mean of its divisors is an integer number (58691886).

Almost surely, 2^305909138 is an apocalyptic number.

305909138 is a deficient number, since it is larger than the sum of its proper divisors (163625950).

305909138 is a wasteful number, since it uses less digits than its factorization.

305909138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3557128.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 305909138 is about 17490.2583743065. The cubic root of 305909138 is about 673.7997053844.

The spelling of 305909138 in words is "three hundred five million, nine hundred nine thousand, one hundred thirty-eight".