18997307 has 8 divisors (see below), whose sum is σ = 21803232. Its totient is φ = 16214400.

The previous prime is 18997273. The next prime is 18997331. The reversal of 18997307 is 70379981.

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

It is a cyclic number.

It is not a de Polignac number, because 18997307 - 2¹² = 18993211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18997337) by changing a digit.

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, 3944 + ... + 7317.

It is an arithmetic number, because the mean of its divisors is an integer number (2725404).

Almost surely, 2^18997307 is an apocalyptic number.

18997307 is a deficient number, since it is larger than the sum of its proper divisors (2805925).

18997307 is a wasteful number, since it uses less digits than its factorization.

18997307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11509.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 18997307 is about 4358.5900243083. The cubic root of 18997307 is about 266.8275572491.

The spelling of 18997307 in words is "eighteen million, nine hundred ninety-seven thousand, three hundred seven".