18674819 has 2 divisors, whose sum is σ = 18674820. Its totient is φ = 18674818.

The previous prime is 18674809. The next prime is 18674837. The reversal of 18674819 is 91847681.

It is a weak prime.

It is an emirp because it is prime and its reverse (91847681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18674819 - 2⁸ = 18674563 is a prime.

It is a super-2 number, since 2×18674819² = 697497729365522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18674819.

It is not a weakly prime, because it can be changed into another prime (18674809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9337409 + 9337410.

It is an arithmetic number, because the mean of its divisors is an integer number (9337410).

Almost surely, 2^18674819 is an apocalyptic number.

18674819 is a deficient number, since it is larger than the sum of its proper divisors (1).

18674819 is an equidigital number, since it uses as much as digits as its factorization.

18674819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 44.

The square root of 18674819 is about 4321.4371452099. The cubic root of 18674819 is about 265.3090922878.

The spelling of 18674819 in words is "eighteen million, six hundred seventy-four thousand, eight hundred nineteen".