997949 has 2 divisors, whose sum is σ = 997950. Its totient is φ = 997948.

The previous prime is 997933. The next prime is 997961. The reversal of 997949 is 949799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 765625 + 232324 = 875^2 + 482^2 .

It is a cyclic number.

It is not a de Polignac number, because 997949 - 2⁴ = 997933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997649) 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, 498974 + 498975.

It is an arithmetic number, because the mean of its divisors is an integer number (498975).

2⁹⁹⁷⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

997949 is a deficient number, since it is larger than the sum of its proper divisors (1).

997949 is an equidigital number, since it uses as much as digits as its factorization.

997949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 183708, while the sum is 47.

The square root of 997949 is about 998.9739736349. The cubic root of 997949 is about 99.9315865400.

The spelling of 997949 in words is "nine hundred ninety-seven thousand, nine hundred forty-nine".