30381918 has 16 divisors (see below), whose sum is σ = 69444480. Its totient is φ = 8680536.

The previous prime is 30381917. The next prime is 30381929. The reversal of 30381918 is 81918303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30381917) 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 7 ways as a sum of consecutive naturals, for example, 361648 + ... + 361731.

It is an arithmetic number, because the mean of its divisors is an integer number (4340280).

Almost surely, 2^30381918 is an apocalyptic number.

30381918 is an abundant number, since it is smaller than the sum of its proper divisors (39062562).

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

30381918 is a wasteful number, since it uses less digits than its factorization.

30381918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723391.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 30381918 is about 5511.9794992362. The cubic root of 30381918 is about 312.0362589353.

The spelling of 30381918 in words is "thirty million, three hundred eighty-one thousand, nine hundred eighteen".