1890377689 has 2 divisors, whose sum is σ = 1890377690. Its totient is φ = 1890377688.

The previous prime is 1890377681. The next prime is 1890377717. The reversal of 1890377689 is 9867730981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1490577664 + 399800025 = 38608^2 + 19995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1890377689 - 2³ = 1890377681 is a prime.

It is not a weakly prime, because it can be changed into another prime (1890377681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945188844 + 945188845.

It is an arithmetic number, because the mean of its divisors is an integer number (945188845).

Almost surely, 2^1890377689 is an apocalyptic number.

It is an amenable number.

1890377689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1890377689 is an equidigital number, since it uses as much as digits as its factorization.

1890377689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4572288, while the sum is 58.

The square root of 1890377689 is about 43478.4738577609. The cubic root of 1890377689 is about 1236.4679423473.

The spelling of 1890377689 in words is "one billion, eight hundred ninety million, three hundred seventy-seven thousand, six hundred eighty-nine".