2118418 has 4 divisors (see below), whose sum is σ = 3177630. Its totient is φ = 1059208.

The previous prime is 2118397. The next prime is 2118419. The reversal of 2118418 is 8148112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1885129 + 233289 = 1373^2 + 483^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2118392 and 2118401.

It is not an unprimeable number, because it can be changed into a prime (2118419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 529603 + ... + 529606.

2^2118418 is an apocalyptic number.

2118418 is a deficient number, since it is larger than the sum of its proper divisors (1059212).

2118418 is a wasteful number, since it uses less digits than its factorization.

2118418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059211.

The product of its digits is 512, while the sum is 25.

The square root of 2118418 is about 1455.4786154389. The cubic root of 2118418 is about 128.4312036170.

The spelling of 2118418 in words is "two million, one hundred eighteen thousand, four hundred eighteen".