1890289 has 2 divisors, whose sum is σ = 1890290. Its totient is φ = 1890288.

The previous prime is 1890283. The next prime is 1890299. The reversal of 1890289 is 9820981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1016064 + 874225 = 1008^2 + 935^2 .

It is a cyclic number.

It is not a de Polignac number, because 1890289 - 2⁵ = 1890257 is a prime.

1890289 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1890283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945144 + 945145.

It is an arithmetic number, because the mean of its divisors is an integer number (945145).

2^1890289 is an apocalyptic number.

It is an amenable number.

1890289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1890289 is an equidigital number, since it uses as much as digits as its factorization.

1890289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 1890289 is about 1374.8778127528. The cubic root of 1890289 is about 123.6448605326.

The spelling of 1890289 in words is "one million, eight hundred ninety thousand, two hundred eighty-nine".