18236945 has 16 divisors (see below), whose sum is σ = 22547712. Its totient is φ = 14152320.

The previous prime is 18236927. The next prime is 18236947. The reversal of 18236945 is 54963281.

It is a happy number.

18236945 is nontrivially palindromic in base 16.

It is not a de Polignac number, because 18236945 - 2¹² = 18232849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18236899 and 18236908.

It is not an unprimeable number, because it can be changed into a prime (18236947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58109 + ... + 58421.

It is an arithmetic number, because the mean of its divisors is an integer number (1409232).

Almost surely, 2^18236945 is an apocalyptic number.

It is an amenable number.

18236945 is a deficient number, since it is larger than the sum of its proper divisors (4310767).

18236945 is a wasteful number, since it uses less digits than its factorization.

18236945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632.

The product of its digits is 51840, while the sum is 38.

The square root of 18236945 is about 4270.4736271285. The cubic root of 18236945 is about 263.2190775321.

The spelling of 18236945 in words is "eighteen million, two hundred thirty-six thousand, nine hundred forty-five".