997226208 has 192 divisors, whose sum is σ = 3192618240. Its totient is φ = 300326400.

The previous prime is 997226207. The next prime is 997226261. The reversal of 997226208 is 802622799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997226207) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3012603 + ... + 3012933.

It is an arithmetic number, because the mean of its divisors is an integer number (16628220).

Almost surely, 2^997226208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997226208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1596309120).

997226208 is an abundant number, since it is smaller than the sum of its proper divisors (2195392032).

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

997226208 is a wasteful number, since it uses less digits than its factorization.

997226208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678 (or 664 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 997226208 is about 31578.8886441559. Note that the first 3 decimals coincide. The cubic root of 997226208 is about 999.0745464666.

The spelling of 997226208 in words is "nine hundred ninety-seven million, two hundred twenty-six thousand, two hundred eight".