18809428 has 24 divisors (see below), whose sum is σ = 36056160. Its totient is φ = 8514720.

The previous prime is 18809419. The next prime is 18809443. The reversal of 18809428 is 82490881.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12163 + ... + 13621.

It is an arithmetic number, because the mean of its divisors is an integer number (1502340).

Almost surely, 2^18809428 is an apocalyptic number.

It is an amenable number.

18809428 is a deficient number, since it is larger than the sum of its proper divisors (17246732).

18809428 is a wasteful number, since it uses less digits than its factorization.

18809428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1767 (or 1765 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 18809428 is about 4336.9837444934. The cubic root of 18809428 is about 265.9450203893.

The spelling of 18809428 in words is "eighteen million, eight hundred nine thousand, four hundred twenty-eight".