30818940 has 24 divisors (see below), whose sum is σ = 86293200. Its totient is φ = 8218368.

The previous prime is 30818903. The next prime is 30818947. The reversal of 30818940 is 4981803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30818947) 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 7 ways as a sum of consecutive naturals, for example, 256765 + ... + 256884.

It is an arithmetic number, because the mean of its divisors is an integer number (3595550).

Almost surely, 2^30818940 is an apocalyptic number.

30818940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30818940 is an abundant number, since it is smaller than the sum of its proper divisors (55474260).

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

30818940 is a wasteful number, since it uses less digits than its factorization.

30818940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513661 (or 513659 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 30818940 is about 5551.4808835121. The cubic root of 30818940 is about 313.5252810108.

It can be divided in two parts, 3081 and 8940, that added together give a palindrome (12021).

The spelling of 30818940 in words is "thirty million, eight hundred eighteen thousand, nine hundred forty".