18123930 has 48 divisors (see below), whose sum is σ = 51408864. Its totient is φ = 4393440.

The previous prime is 18123901. The next prime is 18123947. The reversal of 18123930 is 3932181.

It is a junction number, because it is equal to n+sod(n) for n = 18123894 and 18123903.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8164 + ... + 10143.

It is an arithmetic number, because the mean of its divisors is an integer number (1071018).

Almost surely, 2^18123930 is an apocalyptic number.

18123930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18123930 is an abundant number, since it is smaller than the sum of its proper divisors (33284934).

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

18123930 is a wasteful number, since it uses less digits than its factorization.

18123930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18331 (or 18328 counting only the distinct ones).

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

The square root of 18123930 is about 4257.2209244999. The cubic root of 18123930 is about 262.6742244755.

The spelling of 18123930 in words is "eighteen million, one hundred twenty-three thousand, nine hundred thirty".