308633138 has 16 divisors (see below), whose sum is σ = 522452160. Its totient is φ = 135450000.

The previous prime is 308633137. The next prime is 308633141. The reversal of 308633138 is 831336803.

It is a junction number, because it is equal to n+sod(n) for n = 308633098 and 308633107.

It is not an unprimeable number, because it can be changed into a prime (308633137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241238 + ... + 242513.

It is an arithmetic number, because the mean of its divisors is an integer number (32653260).

Almost surely, 2^308633138 is an apocalyptic number.

308633138 is a deficient number, since it is larger than the sum of its proper divisors (213819022).

308633138 is a wasteful number, since it uses less digits than its factorization.

308633138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483793.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 308633138 is about 17567.9577071440. The cubic root of 308633138 is about 675.7937716333.

The spelling of 308633138 in words is "three hundred eight million, six hundred thirty-three thousand, one hundred thirty-eight".