1975997 has 2 divisors, whose sum is σ = 1975998. Its totient is φ = 1975996.

The previous prime is 1975991. The next prime is 1976011. The reversal of 1975997 is 7995791.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1943236 + 32761 = 1394^2 + 181^2 .

It is an emirp because it is prime and its reverse (7995791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1975997 - 2⁶ = 1975933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1975991) 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, 987998 + 987999.

It is an arithmetic number, because the mean of its divisors is an integer number (987999).

2^1975997 is an apocalyptic number.

It is an amenable number.

1975997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1975997 is an equidigital number, since it uses as much as digits as its factorization.

1975997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 178605, while the sum is 47.

The square root of 1975997 is about 1405.7016041821. The cubic root of 1975997 is about 125.4860436431.

The spelling of 1975997 in words is "one million, nine hundred seventy-five thousand, nine hundred ninety-seven".