18672319 has 2 divisors, whose sum is σ = 18672320. Its totient is φ = 18672318.

The previous prime is 18672281. The next prime is 18672331. The reversal of 18672319 is 91327681.

It is a strong prime.

It is an emirp because it is prime and its reverse (91327681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18672319 - 2¹¹ = 18670271 is a prime.

It is a super-2 number, since 2×18672319² = 697310993675522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18672349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9336159 + 9336160.

It is an arithmetic number, because the mean of its divisors is an integer number (9336160).

Almost surely, 2^18672319 is an apocalyptic number.

18672319 is a deficient number, since it is larger than the sum of its proper divisors (1).

18672319 is an equidigital number, since it uses as much as digits as its factorization.

18672319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 18672319 is about 4321.1478799041. The cubic root of 18672319 is about 265.2972527740.

It can be divided in two parts, 1867 and 2319, that added together give a triangular number (4186 = T₉₁).

The spelling of 18672319 in words is "eighteen million, six hundred seventy-two thousand, three hundred nineteen".