997847 has 4 divisors (see below), whose sum is σ = 1000560. Its totient is φ = 995136.

The previous prime is 997813. The next prime is 997877. The reversal of 997847 is 748799.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 997847 - 2⁶ = 997783 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 997798 and 997807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 698 + ... + 1575.

It is an arithmetic number, because the mean of its divisors is an integer number (250140).

2⁹⁹⁷⁸⁴⁷ is an apocalyptic number.

997847 is a deficient number, since it is larger than the sum of its proper divisors (2713).

997847 is a wasteful number, since it uses less digits than its factorization.

997847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2712.

The product of its digits is 127008, while the sum is 44.

The square root of 997847 is about 998.9229199493. The cubic root of 997847 is about 99.9281817671.

The spelling of 997847 in words is "nine hundred ninety-seven thousand, eight hundred forty-seven".