308136393 has 12 divisors (see below), whose sum is σ = 461570928. Its totient is φ = 205424100.

The previous prime is 308136331. The next prime is 308136401. The reversal of 308136393 is 393631803.

308136393 is a `hidden beast` number, since 3 + 0 + 8 + 13 + 639 + 3 = 666.

It is not a de Polignac number, because 308136393 - 2⁸ = 308136137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (308136793) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 633783 + ... + 634268.

It is an arithmetic number, because the mean of its divisors is an integer number (38464244).

Almost surely, 2^308136393 is an apocalyptic number.

It is an amenable number.

308136393 is a deficient number, since it is larger than the sum of its proper divisors (153434535).

308136393 is an equidigital number, since it uses as much as digits as its factorization.

308136393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268066 (or 1268054 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 36.

The square root of 308136393 is about 17553.8142009080. The cubic root of 308136393 is about 675.4310136114.

The spelling of 308136393 in words is "three hundred eight million, one hundred thirty-six thousand, three hundred ninety-three".