18128929 has 32 divisors (see below), whose sum is σ = 23595264. Its totient is φ = 13547520.

The previous prime is 18128917. The next prime is 18128933. The reversal of 18128929 is 92982181.

It is not a de Polignac number, because 18128929 - 2⁵ = 18128897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18128891 and 18128900.

It is not an unprimeable number, because it can be changed into a prime (18128939) by changing a digit.

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

It is an upside-down number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160377 + ... + 160489.

It is an arithmetic number, because the mean of its divisors is an integer number (737352).

Almost surely, 2^18128929 is an apocalyptic number.

It is an amenable number.

18128929 is a deficient number, since it is larger than the sum of its proper divisors (5466335).

18128929 is a wasteful number, since it uses less digits than its factorization.

18128929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217.

The product of its digits is 20736, while the sum is 40.

The square root of 18128929 is about 4257.8080041261. The cubic root of 18128929 is about 262.6983728021.

The spelling of 18128929 in words is "eighteen million, one hundred twenty-eight thousand, nine hundred twenty-nine".