2118397 has 2 divisors, whose sum is σ = 2118398. Its totient is φ = 2118396.

The previous prime is 2118377. The next prime is 2118419. The reversal of 2118397 is 7938112.

2118397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2105401 + 12996 = 1451^2 + 114^2 .

It is a cyclic number.

It is not a de Polignac number, because 2118397 - 2⁷ = 2118269 is a prime.

It is a Chen prime.

2118397 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2118377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1059198 + 1059199.

It is an arithmetic number, because the mean of its divisors is an integer number (1059199).

2^2118397 is an apocalyptic number.

It is an amenable number.

2118397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2118397 is an equidigital number, since it uses as much as digits as its factorization.

2118397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 2118397 is about 1455.4714012992. The cubic root of 2118397 is about 128.4307792337.

The spelling of 2118397 in words is "two million, one hundred eighteen thousand, three hundred ninety-seven".