18395018 has 4 divisors (see below), whose sum is σ = 27592530. Its totient is φ = 9197508.

The previous prime is 18395017. The next prime is 18395033. The reversal of 18395018 is 81059381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81059381 = 13 ⋅6235337.

It can be written as a sum of positive squares in only one way, i.e., 10738729 + 7656289 = 3277^2 + 2767^2 .

It is a super-3 number, since 3×18395018³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (18395011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4598753 + ... + 4598756.

Almost surely, 2^18395018 is an apocalyptic number.

18395018 is a deficient number, since it is larger than the sum of its proper divisors (9197512).

18395018 is an equidigital number, since it uses as much as digits as its factorization.

18395018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9197511.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 18395018 is about 4288.9413612219. The cubic root of 18395018 is about 263.9773951414.

The spelling of 18395018 in words is "eighteen million, three hundred ninety-five thousand, eighteen".