18728046 has 12 divisors (see below), whose sum is σ = 40577472. Its totient is φ = 6242676.

The previous prime is 18728023. The next prime is 18728051. The reversal of 18728046 is 64082781.

It is a self number, because there is not a number n which added to its sum of digits gives 18728046.

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 5 ways as a sum of consecutive naturals, for example, 520206 + ... + 520241.

It is an arithmetic number, because the mean of its divisors is an integer number (3381456).

Almost surely, 2^18728046 is an apocalyptic number.

18728046 is an abundant number, since it is smaller than the sum of its proper divisors (21849426).

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

18728046 is a wasteful number, since it uses less digits than its factorization.

18728046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040455 (or 1040452 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 18728046 is about 4327.5912468716. The cubic root of 18728046 is about 265.5609146621.

The spelling of 18728046 in words is "eighteen million, seven hundred twenty-eight thousand, forty-six".