2278189 has 2 divisors, whose sum is σ = 2278190. Its totient is φ = 2278188.

The previous prime is 2278181. The next prime is 2278207. The reversal of 2278189 is 9818722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2044900 + 233289 = 1430^2 + 483^2 .

It is a cyclic number.

It is not a de Polignac number, because 2278189 - 2³ = 2278181 is a prime.

It is a Chen prime.

2278189 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2278181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1139094 + 1139095.

It is an arithmetic number, because the mean of its divisors is an integer number (1139095).

2^2278189 is an apocalyptic number.

It is an amenable number.

2278189 is a deficient number, since it is larger than the sum of its proper divisors (1).

2278189 is an equidigital number, since it uses as much as digits as its factorization.

2278189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 37.

The square root of 2278189 is about 1509.3670859006. The cubic root of 2278189 is about 131.5820303867.

The spelling of 2278189 in words is "two million, two hundred seventy-eight thousand, one hundred eighty-nine".