30231918 has 24 divisors (see below), whose sum is σ = 66007656. Its totient is φ = 9999600.

The previous prime is 30231917. The next prime is 30231937. The reversal of 30231918 is 81913203.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 30231891 and 30231900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30231911) 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, 4053 + ... + 8768.

It is an arithmetic number, because the mean of its divisors is an integer number (2750319).

Almost surely, 2^30231918 is an apocalyptic number.

30231918 is an abundant number, since it is smaller than the sum of its proper divisors (35775738).

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

30231918 is a wasteful number, since it uses less digits than its factorization.

30231918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12960 (or 12957 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 30231918 is about 5498.3559360958. The cubic root of 30231918 is about 311.5218885208.

The spelling of 30231918 in words is "thirty million, two hundred thirty-one thousand, nine hundred eighteen".