1898972773 has 2 divisors, whose sum is σ = 1898972774. Its totient is φ = 1898972772.

The previous prime is 1898972771. The next prime is 1898972791. The reversal of 1898972773 is 3772798981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1892511009 + 6461764 = 43503^2 + 2542^2 .

It is a cyclic number.

It is not a de Polignac number, because 1898972773 - 2¹ = 1898972771 is a prime.

Together with 1898972771, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1898972771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 949486386 + 949486387.

It is an arithmetic number, because the mean of its divisors is an integer number (949486387).

Almost surely, 2^1898972773 is an apocalyptic number.

It is an amenable number.

1898972773 is a deficient number, since it is larger than the sum of its proper divisors (1).

1898972773 is an equidigital number, since it uses as much as digits as its factorization.

1898972773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10668672, while the sum is 61.

The square root of 1898972773 is about 43577.2047405521. The cubic root of 1898972773 is about 1238.3390815565.

The spelling of 1898972773 in words is "one billion, eight hundred ninety-eight million, nine hundred seventy-two thousand, seven hundred seventy-three".