1802189 has 2 divisors, whose sum is σ = 1802190. Its totient is φ = 1802188.

The previous prime is 1802149. The next prime is 1802197. The reversal of 1802189 is 9812081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1800964 + 1225 = 1342^2 + 35^2 .

It is an emirp because it is prime and its reverse (9812081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1802189 - 2¹⁶ = 1736653 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1802149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 901094 + 901095.

It is an arithmetic number, because the mean of its divisors is an integer number (901095).

2^1802189 is an apocalyptic number.

It is an amenable number.

1802189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1802189 is an equidigital number, since it uses as much as digits as its factorization.

1802189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1802189 is about 1342.4563307609. The cubic root of 1802189 is about 121.6933308253.

It can be divided in two parts, 1802 and 189, that added together give a palindrome (1991).

The spelling of 1802189 in words is "one million, eight hundred two thousand, one hundred eighty-nine".