18128481 has 12 divisors (see below), whose sum is σ = 28117872. Its totient is φ = 10359048.

The previous prime is 18128479. The next prime is 18128503. The reversal of 18128481 is 18482181.

It is not a de Polignac number, because 18128481 - 2¹ = 18128479 is a prime.

It is a super-3 number, since 3×18128481³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (18128401) 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 11 ways as a sum of consecutive naturals, for example, 61515 + ... + 61808.

It is an arithmetic number, because the mean of its divisors is an integer number (2343156).

Almost surely, 2^18128481 is an apocalyptic number.

It is an amenable number.

18128481 is a deficient number, since it is larger than the sum of its proper divisors (9989391).

18128481 is a wasteful number, since it uses less digits than its factorization.

18128481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123340 (or 123333 counting only the distinct ones).

The product of its digits is 4096, while the sum is 33.

The square root of 18128481 is about 4257.7553945712. The cubic root of 18128481 is about 262.6962088603.

The spelling of 18128481 in words is "eighteen million, one hundred twenty-eight thousand, four hundred eighty-one".