997239 has 8 divisors (see below), whose sum is σ = 1372672. Its totient is φ = 643320.

The previous prime is 997219. The next prime is 997247. The reversal of 997239 is 932799.

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

It is not a de Polignac number, because 997239 - 2⁵ = 997207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 997197 and 997206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997219) 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, 5269 + ... + 5454.

It is an arithmetic number, because the mean of its divisors is an integer number (171584).

2⁹⁹⁷²³⁹ is an apocalyptic number.

997239 is a deficient number, since it is larger than the sum of its proper divisors (375433).

997239 is a wasteful number, since it uses less digits than its factorization.

997239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10757.

The product of its digits is 30618, while the sum is 39.

The square root of 997239 is about 998.6185457921. The cubic root of 997239 is about 99.9078818352.

It can be divided in two parts, 9972 and 39, that added together give a triangular number (10011 = T₁₄₁).

The spelling of 997239 in words is "nine hundred ninety-seven thousand, two hundred thirty-nine".