18273930 has 64 divisors (see below), whose sum is σ = 45767808. Its totient is φ = 4665600.

The previous prime is 18273919. The next prime is 18273943. The reversal of 18273930 is 3937281.

It is a junction number, because it is equal to n+sod(n) for n = 18273891 and 18273900.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112029 + ... + 112191.

It is an arithmetic number, because the mean of its divisors is an integer number (715122).

Almost surely, 2^18273930 is an apocalyptic number.

18273930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18273930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22883904).

18273930 is an abundant number, since it is smaller than the sum of its proper divisors (27493878).

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

18273930 is a wasteful number, since it uses less digits than its factorization.

18273930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 18273930 is about 4274.8017497891. The cubic root of 18273930 is about 263.3968957639.

The spelling of 18273930 in words is "eighteen million, two hundred seventy-three thousand, nine hundred thirty".