18704013 has 4 divisors (see below), whose sum is σ = 24938688. Its totient is φ = 12469340.

The previous prime is 18703969. The next prime is 18704041. The reversal of 18704013 is 31040781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31040781 = 3 ⋅10346927.

It is a cyclic number.

It is not a de Polignac number, because 18704013 - 2⁹ = 18703501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18704053) 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 3 ways as a sum of consecutive naturals, for example, 3117333 + ... + 3117338.

It is an arithmetic number, because the mean of its divisors is an integer number (6234672).

Almost surely, 2^18704013 is an apocalyptic number.

It is an amenable number.

18704013 is a deficient number, since it is larger than the sum of its proper divisors (6234675).

18704013 is an equidigital number, since it uses as much as digits as its factorization.

18704013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6234674.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 18704013 is about 4324.8136376034. The cubic root of 18704013 is about 265.4472712449.

Adding to 18704013 its reverse (31040781), we get a palindrome (49744794).

The spelling of 18704013 in words is "eighteen million, seven hundred four thousand, thirteen".