18135280 has 20 divisors (see below), whose sum is σ = 42164712. Its totient is φ = 7254080.

The previous prime is 18135233. The next prime is 18135287. The reversal of 18135280 is 8253181.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18135287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113266 + ... + 113425.

Almost surely, 2^18135280 is an apocalyptic number.

18135280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18135280 is an abundant number, since it is smaller than the sum of its proper divisors (24029432).

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

18135280 is a wasteful number, since it uses less digits than its factorization.

18135280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226704 (or 226698 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 18135280 is about 4258.5537451111. The cubic root of 18135280 is about 262.7290457406.

The spelling of 18135280 in words is "eighteen million, one hundred thirty-five thousand, two hundred eighty".