18631423 has 2 divisors, whose sum is σ = 18631424. Its totient is φ = 18631422.

The previous prime is 18631409. The next prime is 18631429. The reversal of 18631423 is 32413681.

It is a strong prime.

It is an emirp because it is prime and its reverse (32413681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18631423 - 2⁵ = 18631391 is a prime.

It is equal to p_1189036 and since 18631423 and 1189036 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 18631391 and 18631400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18631429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9315711 + 9315712.

It is an arithmetic number, because the mean of its divisors is an integer number (9315712).

Almost surely, 2^18631423 is an apocalyptic number.

18631423 is a deficient number, since it is larger than the sum of its proper divisors (1).

18631423 is an equidigital number, since it uses as much as digits as its factorization.

18631423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 18631423 is about 4316.4132100623. The cubic root of 18631423 is about 265.1034270543.

The spelling of 18631423 in words is "eighteen million, six hundred thirty-one thousand, four hundred twenty-three".