1890449459 has 2 divisors, whose sum is σ = 1890449460. Its totient is φ = 1890449458.

The previous prime is 1890449401. The next prime is 1890449467. The reversal of 1890449459 is 9549440981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1890449459 - 2⁸ = 1890449203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1890449459.

It is not a weakly prime, because it can be changed into another prime (1890449489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945224729 + 945224730.

It is an arithmetic number, because the mean of its divisors is an integer number (945224730).

Almost surely, 2^1890449459 is an apocalyptic number.

1890449459 is a deficient number, since it is larger than the sum of its proper divisors (1).

1890449459 is an equidigital number, since it uses as much as digits as its factorization.

1890449459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The square root of 1890449459 is about 43479.2992008841. The cubic root of 1890449459 is about 1236.4835900459.

The spelling of 1890449459 in words is "one billion, eight hundred ninety million, four hundred forty-nine thousand, four hundred fifty-nine".