18320613 has 8 divisors (see below), whose sum is σ = 24448800. Its totient is φ = 12203088.

The previous prime is 18320609. The next prime is 18320629. The reversal of 18320613 is 31602381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18320613 - 2² = 18320609 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18320633) 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 7 ways as a sum of consecutive naturals, for example, 3178 + ... + 6836.

It is an arithmetic number, because the mean of its divisors is an integer number (3056100).

Almost surely, 2^18320613 is an apocalyptic number.

It is an amenable number.

18320613 is a deficient number, since it is larger than the sum of its proper divisors (6128187).

18320613 is a wasteful number, since it uses less digits than its factorization.

18320613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5331.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 18320613 is about 4280.2585202298. The cubic root of 18320613 is about 263.6209982866.

Adding to 18320613 its reverse (31602381), we get a palindrome (49922994).

The spelling of 18320613 in words is "eighteen million, three hundred twenty thousand, six hundred thirteen".