2138897 has 2 divisors, whose sum is σ = 2138898. Its totient is φ = 2138896.

The previous prime is 2138879. The next prime is 2138909. The reversal of 2138897 is 7988312.

Together with previous prime (2138879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1547536 + 591361 = 1244^2 + 769^2 .

It is a cyclic number.

It is not a de Polignac number, because 2138897 - 2⁶ = 2138833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2138897.

It is not a weakly prime, because it can be changed into another prime (2138867) 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, 1069448 + 1069449.

It is an arithmetic number, because the mean of its divisors is an integer number (1069449).

2^2138897 is an apocalyptic number.

It is an amenable number.

2138897 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138897 is an equidigital number, since it uses as much as digits as its factorization.

2138897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 38.

The square root of 2138897 is about 1462.4968376034. The cubic root of 2138897 is about 128.8437304089.

The spelling of 2138897 in words is "two million, one hundred thirty-eight thousand, eight hundred ninety-seven".