997730226 has 48 divisors (see below), whose sum is σ = 2237114880. Its totient is φ = 321036480.

The previous prime is 997730189. The next prime is 997730231. The reversal of 997730226 is 622037799.

It is a happy number.

It is a super-2 number, since 2×997730226² = 1990931207748022152, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 242926 + ... + 246998.

It is an arithmetic number, because the mean of its divisors is an integer number (46606560).

Almost surely, 2^997730226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997730226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1118557440).

997730226 is an abundant number, since it is smaller than the sum of its proper divisors (1239384654).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

997730226 is a wasteful number, since it uses less digits than its factorization.

997730226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4551 (or 4548 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 45.

The square root of 997730226 is about 31586.8679359002. The cubic root of 997730226 is about 999.2428355133.

The spelling of 997730226 in words is "nine hundred ninety-seven million, seven hundred thirty thousand, two hundred twenty-six".