997797 has 8 divisors (see below), whose sum is σ = 1373440. Its totient is φ = 643680.

The previous prime is 997793. The next prime is 997807. The reversal of 997797 is 797799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 997797 - 2² = 997793 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5272 + ... + 5457.

It is an arithmetic number, because the mean of its divisors is an integer number (171680).

2⁹⁹⁷⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

997797 is a deficient number, since it is larger than the sum of its proper divisors (375643).

997797 is a wasteful number, since it uses less digits than its factorization.

997797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10763.

The product of its digits is 250047, while the sum is 48.

The square root of 997797 is about 998.8978926797. The cubic root of 997797 is about 99.9265126760.

It can be divided in two parts, 9977 and 97, that multiplied together give a palindrome (967769).

The spelling of 997797 in words is "nine hundred ninety-seven thousand, seven hundred ninety-seven".