18728084 has 24 divisors (see below), whose sum is σ = 35902440. Its totient is φ = 8508416.

The previous prime is 18728071. The next prime is 18728093. The reversal of 18728084 is 48082781.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1322500 + 17405584 = 1150^2 + 4172^2 .

It is a super-2 number, since 2×18728084² = 701482260622112, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2777 + ... + 6720.

It is an arithmetic number, because the mean of its divisors is an integer number (1495935).

Almost surely, 2^18728084 is an apocalyptic number.

It is an amenable number.

18728084 is a deficient number, since it is larger than the sum of its proper divisors (17174356).

18728084 is a wasteful number, since it uses less digits than its factorization.

18728084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9547 (or 9545 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 18728084 is about 4327.5956373025. The cubic root of 18728084 is about 265.5610942735.

The spelling of 18728084 in words is "eighteen million, seven hundred twenty-eight thousand, eighty-four".