18679873 has 2 divisors, whose sum is σ = 18679874. Its totient is φ = 18679872.

The previous prime is 18679861. The next prime is 18679883. The reversal of 18679873 is 37897681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13630864 + 5049009 = 3692^2 + 2247^2 .

It is an emirp because it is prime and its reverse (37897681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18679873 - 2¹⁷ = 18548801 is a prime.

It is a super-3 number, since 3×18679873³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (18679823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9339936 + 9339937.

It is an arithmetic number, because the mean of its divisors is an integer number (9339937).

Almost surely, 2^18679873 is an apocalyptic number.

It is an amenable number.

18679873 is a deficient number, since it is larger than the sum of its proper divisors (1).

18679873 is an equidigital number, since it uses as much as digits as its factorization.

18679873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 49.

The square root of 18679873 is about 4322.0218648221. The cubic root of 18679873 is about 265.3330238220. Note that the first 3 decimals are identical.

The spelling of 18679873 in words is "eighteen million, six hundred seventy-nine thousand, eight hundred seventy-three".