997907 has 4 divisors (see below), whose sum is σ = 1000920. Its totient is φ = 994896.

The previous prime is 997897. The next prime is 997933. The reversal of 997907 is 709799.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 997907 - 2⁴ = 997891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 938 + ... + 1695.

It is an arithmetic number, because the mean of its divisors is an integer number (250230).

2⁹⁹⁷⁹⁰⁷ is an apocalyptic number.

997907 is a deficient number, since it is larger than the sum of its proper divisors (3013).

997907 is a wasteful number, since it uses less digits than its factorization.

997907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3012.

The product of its (nonzero) digits is 35721, while the sum is 41.

The square root of 997907 is about 998.9529518451. The cubic root of 997907 is about 99.9301846028.

The spelling of 997907 in words is "nine hundred ninety-seven thousand, nine hundred seven".