1890540473 has 2 divisors, whose sum is σ = 1890540474. Its totient is φ = 1890540472.

The previous prime is 1890540391. The next prime is 1890540497. The reversal of 1890540473 is 3740450981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1009459984 + 881080489 = 31772^2 + 29683^2 .

It is an emirp because it is prime and its reverse (3740450981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1890540473 - 2¹⁸ = 1890278329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1890540473.

It is not a weakly prime, because it can be changed into another prime (1890540973) 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, 945270236 + 945270237.

It is an arithmetic number, because the mean of its divisors is an integer number (945270237).

Almost surely, 2^1890540473 is an apocalyptic number.

It is an amenable number.

1890540473 is a deficient number, since it is larger than the sum of its proper divisors (1).

1890540473 is an equidigital number, since it uses as much as digits as its factorization.

1890540473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 1890540473 is about 43480.3458242917. The cubic root of 1890540473 is about 1236.5034328600.

The spelling of 1890540473 in words is "one billion, eight hundred ninety million, five hundred forty thousand, four hundred seventy-three".