18428406 has 16 divisors (see below), whose sum is σ = 36900144. Its totient is φ = 6135584.

The previous prime is 18428341. The next prime is 18428413. The reversal of 18428406 is 60482481.

It is a super-2 number, since 2×18428406² = 679212295401672, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7120 + ... + 9356.

It is an arithmetic number, because the mean of its divisors is an integer number (2306259).

Almost surely, 2^18428406 is an apocalyptic number.

18428406 is an abundant number, since it is smaller than the sum of its proper divisors (18471738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18428406 is a wasteful number, since it uses less digits than its factorization.

18428406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3615.

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 18428406 is about 4292.8319324194. The cubic root of 18428406 is about 264.1370099204.

The spelling of 18428406 in words is "eighteen million, four hundred twenty-eight thousand, four hundred six".