18040168 has 8 divisors (see below), whose sum is σ = 33825330. Its totient is φ = 9020080.

The previous prime is 18040147. The next prime is 18040181. The reversal of 18040168 is 86104081.

It can be written as a sum of positive squares in only one way, i.e., 17960644 + 79524 = 4238^2 + 282^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×18040168² = 650895322936448, which contains 22 as substring.

It is a plaindrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1127503 + ... + 1127518.

Almost surely, 2^18040168 is an apocalyptic number.

It is an amenable number.

18040168 is a deficient number, since it is larger than the sum of its proper divisors (15785162).

18040168 is a wasteful number, since it uses less digits than its factorization.

18040168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2255027 (or 2255023 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 18040168 is about 4247.3718933006. The cubic root of 18040168 is about 262.2689389246.

The spelling of 18040168 in words is "eighteen million, forty thousand, one hundred sixty-eight".