997972308 has 144 divisors (see below), whose sum is σ = 2674788480. Its totient is φ = 313420800.

The previous prime is 997972307. The next prime is 997972333. The reversal of 997972308 is 803279799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997972307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9326791 + ... + 9326897.

It is an arithmetic number, because the mean of its divisors is an integer number (18574920).

Almost surely, 2^997972308 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 997972308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1337394240).

997972308 is an abundant number, since it is smaller than the sum of its proper divisors (1676816172).

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

997972308 is a wasteful number, since it uses less digits than its factorization.

997972308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 313 counting only the distinct ones).

The product of its (nonzero) digits is 1714608, while the sum is 54.

The square root of 997972308 is about 31590.6997073506. The cubic root of 997972308 is about 999.3236453141.

The spelling of 997972308 in words is "nine hundred ninety-seven million, nine hundred seventy-two thousand, three hundred eight".