997399 has 8 divisors (see below), whose sum is σ = 1089872. Its totient is φ = 907200.

The previous prime is 997391. The next prime is 997427. The reversal of 997399 is 993799.

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 997399 - 2³ = 997391 is a prime.

It is a Duffinian number.

997399 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997391) 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 7 ways as a sum of consecutive naturals, for example, 424 + ... + 1474.

It is an arithmetic number, because the mean of its divisors is an integer number (136234).

2⁹⁹⁷³⁹⁹ is an apocalyptic number.

997399 is a deficient number, since it is larger than the sum of its proper divisors (92473).

997399 is a wasteful number, since it uses less digits than its factorization.

997399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137.

The product of its digits is 137781, while the sum is 46.

The square root of 997399 is about 998.6986532483. The cubic root of 997399 is about 99.9132247223.

Subtracting from 997399 its reverse (993799), we obtain a square (3600 = 60²).

The spelling of 997399 in words is "nine hundred ninety-seven thousand, three hundred ninety-nine".