18018429 has 32 divisors (see below), whose sum is σ = 28581504. Its totient is φ = 9953280.

The previous prime is 18018401. The next prime is 18018433. The reversal of 18018429 is 92481081.

It is not a de Polignac number, because 18018429 - 2⁵ = 18018397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18018429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18018029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41397 + ... + 41829.

It is an arithmetic number, because the mean of its divisors is an integer number (893172).

Almost surely, 2^18018429 is an apocalyptic number.

It is an amenable number.

18018429 is a deficient number, since it is larger than the sum of its proper divisors (10563075).

18018429 is a wasteful number, since it uses less digits than its factorization.

18018429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 18018429 is about 4244.8120099717. The cubic root of 18018429 is about 262.1635489942.

The spelling of 18018429 in words is "eighteen million, eighteen thousand, four hundred twenty-nine".