997853 has 8 divisors (see below), whose sum is σ = 1037400. Its totient is φ = 959040.

The previous prime is 997813. The next prime is 997877. The reversal of 997853 is 358799.

It can be written as a sum of positive squares in 4 ways, for example, as 3844 + 994009 = 62^2 + 997^2 .

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

It is not a de Polignac number, because 997853 - 2⁸ = 997597 is a prime.

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 997853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997813) 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, 5423 + ... + 5603.

It is an arithmetic number, because the mean of its divisors is an integer number (129675).

2⁹⁹⁷⁸⁵³ is an apocalyptic number.

It is an amenable number.

997853 is a deficient number, since it is larger than the sum of its proper divisors (39547).

997853 is a wasteful number, since it uses less digits than its factorization.

997853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367.

The product of its digits is 68040, while the sum is 41.

The square root of 997853 is about 998.9259231795. The cubic root of 997853 is about 99.9283820543.

The spelling of 997853 in words is "nine hundred ninety-seven thousand, eight hundred fifty-three".