1890090977 has 2 divisors, whose sum is σ = 1890090978. Its totient is φ = 1890090976.

The previous prime is 1890090967. The next prime is 1890091057. The reversal of 1890090977 is 7790900981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1865894416 + 24196561 = 43196^2 + 4919^2 .

It is a cyclic number.

It is not a de Polignac number, because 1890090977 - 2¹² = 1890086881 is a prime.

It is not a weakly prime, because it can be changed into another prime (1890090967) 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, 945045488 + 945045489.

It is an arithmetic number, because the mean of its divisors is an integer number (945045489).

Almost surely, 2^1890090977 is an apocalyptic number.

It is an amenable number.

1890090977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1890090977 is an equidigital number, since it uses as much as digits as its factorization.

1890090977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 50.

The square root of 1890090977 is about 43475.1765608836. The cubic root of 1890090977 is about 1236.4054278345.

The spelling of 1890090977 in words is "one billion, eight hundred ninety million, ninety thousand, nine hundred seventy-seven".