18428623 has 2 divisors, whose sum is σ = 18428624. Its totient is φ = 18428622.

The previous prime is 18428621. The next prime is 18428633. The reversal of 18428623 is 32682481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18428623 - 2¹ = 18428621 is a prime.

It is a super-2 number, since 2×18428623² = 679228291352258, which contains 22 as substring.

Together with 18428621, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18428621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9214311 + 9214312.

It is an arithmetic number, because the mean of its divisors is an integer number (9214312).

Almost surely, 2^18428623 is an apocalyptic number.

18428623 is a deficient number, since it is larger than the sum of its proper divisors (1).

18428623 is an equidigital number, since it uses as much as digits as its factorization.

18428623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 34.

The square root of 18428623 is about 4292.8572070359. The cubic root of 18428623 is about 264.1380466804.

The spelling of 18428623 in words is "eighteen million, four hundred twenty-eight thousand, six hundred twenty-three".