18180280 has 16 divisors (see below), whose sum is σ = 40905720. Its totient is φ = 7272096.

The previous prime is 18180269. The next prime is 18180289. The reversal of 18180280 is 8208181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18180289) 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, 227214 + ... + 227293.

Almost surely, 2^18180280 is an apocalyptic number.

18180280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18180280 is an abundant number, since it is smaller than the sum of its proper divisors (22725440).

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

18180280 is a wasteful number, since it uses less digits than its factorization.

18180280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454518 (or 454514 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 18180280 is about 4263.8339554912. The cubic root of 18180280 is about 262.9461739326.

The spelling of 18180280 in words is "eighteen million, one hundred eighty thousand, two hundred eighty".