1898990077 has 2 divisors, whose sum is σ = 1898990078. Its totient is φ = 1898990076.

The previous prime is 1898990059. The next prime is 1898990113. The reversal of 1898990077 is 7700998981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 958893156 + 940096921 = 30966^2 + 30661^2 .

It is a cyclic number.

It is not a de Polignac number, because 1898990077 - 2⁷ = 1898989949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1898990677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 949495038 + 949495039.

It is an arithmetic number, because the mean of its divisors is an integer number (949495039).

Almost surely, 2^1898990077 is an apocalyptic number.

It is an amenable number.

1898990077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1898990077 is an equidigital number, since it uses as much as digits as its factorization.

1898990077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 58.

The square root of 1898990077 is about 43577.4032842711. The cubic root of 1898990077 is about 1238.3428429153.

The spelling of 1898990077 in words is "one billion, eight hundred ninety-eight million, nine hundred ninety thousand, seventy-seven".