18129089 has 16 divisors (see below), whose sum is σ = 21669120. Its totient is φ = 14972160.

The previous prime is 18129077. The next prime is 18129091. The reversal of 18129089 is 98092181.

It is a cyclic number.

It is not a de Polignac number, because 18129089 - 2⁸ = 18128833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18129689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3752 + ... + 7094.

It is an arithmetic number, because the mean of its divisors is an integer number (1354320).

Almost surely, 2^18129089 is an apocalyptic number.

It is an amenable number.

18129089 is a deficient number, since it is larger than the sum of its proper divisors (3540031).

18129089 is a wasteful number, since it uses less digits than its factorization.

18129089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3400.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 18129089 is about 4257.8267930953. The cubic root of 18129089 is about 262.6991456298.

It can be divided in two parts, 1812 and 9089, that added together give a palindrome (10901).

The spelling of 18129089 in words is "eighteen million, one hundred twenty-nine thousand, eighty-nine".