1997969 has 2 divisors, whose sum is σ = 1997970. Its totient is φ = 1997968.

The previous prime is 1997939. The next prime is 1997999. The reversal of 1997969 is 9697991.

It is a balanced prime because it is at equal distance from previous prime (1997939) and next prime (1997999).

It can be written as a sum of positive squares in only one way, i.e., 1993744 + 4225 = 1412^2 + 65^2 .

It is an emirp because it is prime and its reverse (9697991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1997969 - 2⁸ = 1997713 is a prime.

It is a super-2 number, since 2×1997969² = 7983760249922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1997939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998984 + 998985.

It is an arithmetic number, because the mean of its divisors is an integer number (998985).

2^1997969 is an apocalyptic number.

It is an amenable number.

1997969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997969 is an equidigital number, since it uses as much as digits as its factorization.

1997969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 275562, while the sum is 50.

The square root of 1997969 is about 1413.4953130449. The cubic root of 1997969 is about 125.9494422173.

The spelling of 1997969 in words is "one million, nine hundred ninety-seven thousand, nine hundred sixty-nine".