997963 has 2 divisors, whose sum is σ = 997964. Its totient is φ = 997962.

The previous prime is 997961. The next prime is 997973. The reversal of 997963 is 369799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997963 - 2¹ = 997961 is a prime.

Together with 997961, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (997961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498981 + 498982.

It is an arithmetic number, because the mean of its divisors is an integer number (498982).

2⁹⁹⁷⁹⁶³ is an apocalyptic number.

997963 is a deficient number, since it is larger than the sum of its proper divisors (1).

997963 is an equidigital number, since it uses as much as digits as its factorization.

997963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91854, while the sum is 43.

The square root of 997963 is about 998.9809807999. The cubic root of 997963 is about 99.9320538437.

It can be divided in two parts, 99796 and 3, that added together give a palindrome (99799).

The spelling of 997963 in words is "nine hundred ninety-seven thousand, nine hundred sixty-three".