1890389 has 2 divisors, whose sum is σ = 1890390. Its totient is φ = 1890388.

The previous prime is 1890379. The next prime is 1890397. The reversal of 1890389 is 9830981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1844164 + 46225 = 1358^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 1890389 - 2⁴ = 1890373 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1890319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945194 + 945195.

It is an arithmetic number, because the mean of its divisors is an integer number (945195).

2^1890389 is an apocalyptic number.

It is an amenable number.

1890389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1890389 is an equidigital number, since it uses as much as digits as its factorization.

1890389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 1890389 is about 1374.9141791399. The cubic root of 1890389 is about 123.6470408461.

The spelling of 1890389 in words is "one million, eight hundred ninety thousand, three hundred eighty-nine".