18006428 has 12 divisors (see below), whose sum is σ = 34375992. Its totient is φ = 8184720.

The previous prime is 18006413. The next prime is 18006431. The reversal of 18006428 is 82460081.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18006428.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204575 + ... + 204662.

It is an arithmetic number, because the mean of its divisors is an integer number (2864666).

Almost surely, 2^18006428 is an apocalyptic number.

It is an amenable number.

18006428 is a deficient number, since it is larger than the sum of its proper divisors (16369564).

18006428 is a wasteful number, since it uses less digits than its factorization.

18006428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409252 (or 409250 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 18006428 is about 4243.3981665642. The cubic root of 18006428 is about 262.1053322371.

It can be divided in two parts, 1800 and 6428, that added together give a palindrome (8228).

The spelling of 18006428 in words is "eighteen million, six thousand, four hundred twenty-eight".