997775 has 12 divisors (see below), whose sum is σ = 1252152. Its totient is φ = 788640.

The previous prime is 997769. The next prime is 997783. The reversal of 997775 is 577799.

It is not a de Polignac number, because 997775 - 2¹² = 993679 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 2489 + ... + 2861.

It is an arithmetic number, because the mean of its divisors is an integer number (104346).

2⁹⁹⁷⁷⁷⁵ is an apocalyptic number.

997775 is a deficient number, since it is larger than the sum of its proper divisors (254377).

997775 is a wasteful number, since it uses less digits than its factorization.

997775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490 (or 485 counting only the distinct ones).

The product of its digits is 138915, while the sum is 44.

The square root of 997775 is about 998.8868804825. The cubic root of 997775 is about 99.9257782583.

The spelling of 997775 in words is "nine hundred ninety-seven thousand, seven hundred seventy-five".