18073530 has 80 divisors (see below), whose sum is σ = 49632264. Its totient is φ = 4717440.

The previous prime is 18073519. The next prime is 18073543. The reversal of 18073530 is 3537081.

It can be written as a sum of positive squares in 4 ways, for example, as 10439361 + 7634169 = 3231^2 + 2763^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 18073494 and 18073503.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 42720 + ... + 43140.

Almost surely, 2^18073530 is an apocalyptic number.

18073530 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 18073530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24816132).

18073530 is an abundant number, since it is smaller than the sum of its proper divisors (31558734).

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

18073530 is a wasteful number, since it uses less digits than its factorization.

18073530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 18073530 is about 4251.2974490148. The cubic root of 18073530 is about 262.4305122194.

The spelling of 18073530 in words is "eighteen million, seventy-three thousand, five hundred thirty".