1889847649 has 4 divisors (see below), whose sum is σ = 1920828820. Its totient is φ = 1858866480.

The previous prime is 1889847643. The next prime is 1889847671. The reversal of 1889847649 is 9467489881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9467489881 = 1657 ⋅5713633.

It can be written as a sum of positive squares in 2 ways, for example, as 358534225 + 1531313424 = 18935^2 + 39132^2 .

It is a cyclic number.

It is not a de Polignac number, because 1889847649 - 2¹⁹ = 1889323361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1889847643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15490494 + ... + 15490615.

It is an arithmetic number, because the mean of its divisors is an integer number (480207205).

Almost surely, 2^1889847649 is an apocalyptic number.

It is an amenable number.

1889847649 is a deficient number, since it is larger than the sum of its proper divisors (30981171).

1889847649 is an equidigital number, since it uses as much as digits as its factorization.

1889847649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30981170.

The product of its digits is 27869184, while the sum is 64.

The square root of 1889847649 is about 43472.3780002889. The cubic root of 1889847649 is about 1236.3523677834.

The spelling of 1889847649 in words is "one billion, eight hundred eighty-nine million, eight hundred forty-seven thousand, six hundred forty-nine".