18236473 has 2 divisors, whose sum is σ = 18236474. Its totient is φ = 18236472.

The previous prime is 18236453. The next prime is 18236479. The reversal of 18236473 is 37463281.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18045504 + 190969 = 4248^2 + 437^2 .

It is an emirp because it is prime and its reverse (37463281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18236473 - 2¹³ = 18228281 is a prime.

It is not a weakly prime, because it can be changed into another prime (18236479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9118236 + 9118237.

It is an arithmetic number, because the mean of its divisors is an integer number (9118237).

Almost surely, 2^18236473 is an apocalyptic number.

It is an amenable number.

18236473 is a deficient number, since it is larger than the sum of its proper divisors (1).

18236473 is an equidigital number, since it uses as much as digits as its factorization.

18236473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 34.

The square root of 18236473 is about 4270.4183635798. The cubic root of 18236473 is about 263.2168066752.

The spelling of 18236473 in words is "eighteen million, two hundred thirty-six thousand, four hundred seventy-three".