2187397 has 2 divisors, whose sum is σ = 2187398. Its totient is φ = 2187396.

The previous prime is 2187389. The next prime is 2187421. The reversal of 2187397 is 7937812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1366561 + 820836 = 1169^2 + 906^2 .

It is a cyclic number.

It is not a de Polignac number, because 2187397 - 2³ = 2187389 is a prime.

2187397 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2187197) 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, 1093698 + 1093699.

It is an arithmetic number, because the mean of its divisors is an integer number (1093699).

2^2187397 is an apocalyptic number.

It is an amenable number.

2187397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2187397 is an equidigital number, since it uses as much as digits as its factorization.

2187397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 37.

The square root of 2187397 is about 1478.9851250097. The cubic root of 2187397 is about 129.8103150785.

The spelling of 2187397 in words is "two million, one hundred eighty-seven thousand, three hundred ninety-seven".