997863 has 8 divisors (see below), whose sum is σ = 1335168. Its totient is φ = 662904.

The previous prime is 997813. The next prime is 997877. The reversal of 997863 is 368799.

It is a happy number.

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

It is not a de Polignac number, because 997863 - 2¹³ = 989671 is a prime.

It is a zygodrome in base 2.

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, 1120 + ... + 1802.

It is an arithmetic number, because the mean of its divisors is an integer number (166896).

2⁹⁹⁷⁸⁶³ is an apocalyptic number.

997863 is a deficient number, since it is larger than the sum of its proper divisors (337305).

997863 is a wasteful number, since it uses less digits than its factorization.

997863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173.

The product of its digits is 81648, while the sum is 42.

The square root of 997863 is about 998.9309285431. The cubic root of 997863 is about 99.9287158645.

The spelling of 997863 in words is "nine hundred ninety-seven thousand, eight hundred sixty-three".