997919 has 8 divisors (see below), whose sum is σ = 1112160. Its totient is φ = 889056.

The previous prime is 997897. The next prime is 997933. The reversal of 997919 is 919799.

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

It is a cyclic number.

It is not a de Polignac number, because 997919 - 2⁸ = 997663 is a prime.

It is a super-2 number, since 2×997919² = 1991684661122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 997919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997949) 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 in 7 ways as a sum of consecutive naturals, for example, 947 + ... + 1700.

It is an arithmetic number, because the mean of its divisors is an integer number (139020).

2⁹⁹⁷⁹¹⁹ is an apocalyptic number.

997919 is a deficient number, since it is larger than the sum of its proper divisors (114241).

997919 is a wasteful number, since it uses less digits than its factorization.

997919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2689.

The product of its digits is 45927, while the sum is 44.

The square root of 997919 is about 998.9589581159. The cubic root of 997919 is about 99.9305851603.

The spelling of 997919 in words is "nine hundred ninety-seven thousand, nine hundred nineteen".