18018905 has 16 divisors (see below), whose sum is σ = 22560768. Its totient is φ = 13800000.

The previous prime is 18018901. The next prime is 18018911. The reversal of 18018905 is 50981081.

It is a happy number.

It is not a de Polignac number, because 18018905 - 2² = 18018901 is a prime.

It is a super-4 number, since 4×18018905⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18018901) 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, 15080 + ... + 16230.

It is an arithmetic number, because the mean of its divisors is an integer number (1410048).

Almost surely, 2^18018905 is an apocalyptic number.

It is an amenable number.

18018905 is a deficient number, since it is larger than the sum of its proper divisors (4541863).

18018905 is a wasteful number, since it uses less digits than its factorization.

18018905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 18018905 is about 4244.8680780444. The cubic root of 18018905 is about 262.1658575335.

Adding to 18018905 its reverse (50981081), we get a palindrome (68999986).

The spelling of 18018905 in words is "eighteen million, eighteen thousand, nine hundred five".