1898707997 has 2 divisors, whose sum is σ = 1898707998. Its totient is φ = 1898707996.

The previous prime is 1898707961. The next prime is 1898708011. The reversal of 1898707997 is 7997078981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1500865081 + 397842916 = 38741^2 + 19946^2 .

It is an emirp because it is prime and its reverse (7997078981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1898707997 - 2¹² = 1898703901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1898707397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 949353998 + 949353999.

It is an arithmetic number, because the mean of its divisors is an integer number (949353999).

Almost surely, 2^1898707997 is an apocalyptic number.

It is an amenable number.

1898707997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1898707997 is an equidigital number, since it uses as much as digits as its factorization.

1898707997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16003008, while the sum is 65.

The square root of 1898707997 is about 43574.1666242741. The cubic root of 1898707997 is about 1238.2815245247.

The spelling of 1898707997 in words is "one billion, eight hundred ninety-eight million, seven hundred seven thousand, nine hundred ninety-seven".