997222 has 4 divisors (see below), whose sum is σ = 1495836. Its totient is φ = 498610.

The previous prime is 997219. The next prime is 997247. The reversal of 997222 is 222799.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249304 + ... + 249307.

It is an arithmetic number, because the mean of its divisors is an integer number (373959).

2⁹⁹⁷²²² is an apocalyptic number.

997222 is a deficient number, since it is larger than the sum of its proper divisors (498614).

997222 is a wasteful number, since it uses less digits than its factorization.

997222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498613.

The product of its digits is 4536, while the sum is 31.

The square root of 997222 is about 998.6100339973. The cubic root of 997222 is about 99.9073141198.

The spelling of 997222 in words is "nine hundred ninety-seven thousand, two hundred twenty-two".