308981838 has 64 divisors (see below), whose sum is σ = 723168000. Its totient is φ = 87010560.

The previous prime is 308981837. The next prime is 308981861. The reversal of 308981838 is 838189803.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308981837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64138 + ... + 68786.

It is an arithmetic number, because the mean of its divisors is an integer number (11299500).

Almost surely, 2^308981838 is an apocalyptic number.

308981838 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 308981838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (361584000).

308981838 is an abundant number, since it is smaller than the sum of its proper divisors (414186162).

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

308981838 is a wasteful number, since it uses less digits than its factorization.

308981838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4737.

The product of its (nonzero) digits is 331776, while the sum is 48.

The square root of 308981838 is about 17577.8792236151. The cubic root of 308981838 is about 676.0481843623.

The spelling of 308981838 in words is "three hundred eight million, nine hundred eighty-one thousand, eight hundred thirty-eight".