308838138 has 16 divisors (see below), whose sum is σ = 705915840. Its totient is φ = 88239456.

The previous prime is 308838137. The next prime is 308838163. The reversal of 308838138 is 831838803.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 7353289 = 308838138 / (3 + 0 + 8 + 8 + 3 + 8 + 1 + 3 + 8).

It is a self number, because there is not a number n which added to its sum of digits gives 308838138.

It is not an unprimeable number, because it can be changed into a prime (308838137) 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 7 ways as a sum of consecutive naturals, for example, 3676603 + ... + 3676686.

It is an arithmetic number, because the mean of its divisors is an integer number (44119740).

Almost surely, 2^308838138 is an apocalyptic number.

308838138 is an abundant number, since it is smaller than the sum of its proper divisors (397077702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

308838138 is a wasteful number, since it uses less digits than its factorization.

308838138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7353301.

The product of its (nonzero) digits is 110592, while the sum is 42.

The square root of 308838138 is about 17573.7912244342. The cubic root of 308838138 is about 675.9433635428.

The spelling of 308838138 in words is "three hundred eight million, eight hundred thirty-eight thousand, one hundred thirty-eight".