18659973 has 4 divisors (see below), whose sum is σ = 24879968. Its totient is φ = 12439980.

The previous prime is 18659959. The next prime is 18660011. The reversal of 18659973 is 37995681.

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.

It is not a de Polignac number, because 18659973 - 2¹² = 18655877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18659873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3109993 + ... + 3109998.

It is an arithmetic number, because the mean of its divisors is an integer number (6219992).

Almost surely, 2^18659973 is an apocalyptic number.

It is an amenable number.

18659973 is a deficient number, since it is larger than the sum of its proper divisors (6219995).

18659973 is an equidigital number, since it uses as much as digits as its factorization.

18659973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6219994.

The product of its digits is 408240, while the sum is 48.

The square root of 18659973 is about 4319.7190880889. The cubic root of 18659973 is about 265.2387690183.

The spelling of 18659973 in words is "eighteen million, six hundred fifty-nine thousand, nine hundred seventy-three".