18728361 has 16 divisors (see below), whose sum is σ = 27864000. Its totient is φ = 12432384.

The previous prime is 18728323. The next prime is 18728363. The reversal of 18728361 is 16382781.

It is not a de Polignac number, because 18728361 - 2¹¹ = 18726313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18728363) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5590 + ... + 8288.

It is an arithmetic number, because the mean of its divisors is an integer number (1741500).

Almost surely, 2^18728361 is an apocalyptic number.

It is an amenable number.

18728361 is a deficient number, since it is larger than the sum of its proper divisors (9135639).

18728361 is a wasteful number, since it uses less digits than its factorization.

18728361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2965 (or 2959 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 18728361 is about 4327.6276410985. The cubic root of 18728361 is about 265.5624035382.

The spelling of 18728361 in words is "eighteen million, seven hundred twenty-eight thousand, three hundred sixty-one".