1988797 has 2 divisors, whose sum is σ = 1988798. Its totient is φ = 1988796.

The previous prime is 1988759. The next prime is 1988801. The reversal of 1988797 is 7978891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1454436 + 534361 = 1206^2 + 731^2 .

It is a cyclic number.

It is not a de Polignac number, because 1988797 - 2⁷ = 1988669 is a prime.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 1988797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1988197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994398 + 994399.

It is an arithmetic number, because the mean of its divisors is an integer number (994399).

2^1988797 is an apocalyptic number.

It is an amenable number.

1988797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988797 is an equidigital number, since it uses as much as digits as its factorization.

1988797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 49.

The square root of 1988797 is about 1410.2471414614. The cubic root of 1988797 is about 125.7564161110.

The spelling of 1988797 in words is "one million, nine hundred eighty-eight thousand, seven hundred ninety-seven".