18257623 has 2 divisors, whose sum is σ = 18257624. Its totient is φ = 18257622.

The previous prime is 18257621. The next prime is 18257627. The reversal of 18257623 is 32675281.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (32675281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18257623 - 2¹ = 18257621 is a prime.

It is a super-4 number, since 4×18257623⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

Together with 18257621, 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 (18257621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9128811 + 9128812.

It is an arithmetic number, because the mean of its divisors is an integer number (9128812).

Almost surely, 2^18257623 is an apocalyptic number.

18257623 is a deficient number, since it is larger than the sum of its proper divisors (1).

18257623 is an equidigital number, since it uses as much as digits as its factorization.

18257623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 34.

The square root of 18257623 is about 4272.8939841751. The cubic root of 18257623 is about 263.3185237982.

The spelling of 18257623 in words is "eighteen million, two hundred fifty-seven thousand, six hundred twenty-three".