308796138 has 72 divisors (see below), whose sum is σ = 807180192. Its totient is φ = 88220664.

The previous prime is 308796127. The next prime is 308796139. The reversal of 308796138 is 831697803.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 308796093 and 308796102.

It is not an unprimeable number, because it can be changed into a prime (308796139) 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 35 ways as a sum of consecutive naturals, for example, 17331 + ... + 30297.

It is an arithmetic number, because the mean of its divisors is an integer number (11210836).

Almost surely, 2^308796138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 308796138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (403590096).

308796138 is an abundant number, since it is smaller than the sum of its proper divisors (498384054).

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

308796138 is a wasteful number, since it uses less digits than its factorization.

308796138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12998 (or 12979 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 308796138 is about 17572.5962225278. The cubic root of 308796138 is about 675.9127208373.

It can be divided in two parts, 3087 and 96138, that added together give a square (99225 = 315²).

The spelling of 308796138 in words is "three hundred eight million, seven hundred ninety-six thousand, one hundred thirty-eight".