18123280 has 40 divisors (see below), whose sum is σ = 48157632. Its totient is φ = 6213504.

The previous prime is 18123263. The next prime is 18123323. The reversal of 18123280 is 8232181.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15622 + ... + 16741.

Almost surely, 2^18123280 is an apocalyptic number.

18123280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18123280 is an abundant number, since it is smaller than the sum of its proper divisors (30034352).

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

18123280 is a wasteful number, since it uses less digits than its factorization.

18123280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32383 (or 32377 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 18123280 is about 4257.1445829335. The cubic root of 18123280 is about 262.6710842389.

The spelling of 18123280 in words is "eighteen million, one hundred twenty-three thousand, two hundred eighty".