997211320 has 64 divisors (see below), whose sum is σ = 2576563200. Its totient is φ = 340260480.

The previous prime is 997211297. The next prime is 997211329. The reversal of 997211320 is 23112799.

It is a happy number.

It is a super-2 number, since 2×997211320² = 1988860833472284800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997211329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50641 + ... + 67519.

It is an arithmetic number, because the mean of its divisors is an integer number (40258800).

Almost surely, 2^997211320 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 997211320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1288281600).

997211320 is an abundant number, since it is smaller than the sum of its proper divisors (1579351880).

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

997211320 is a wasteful number, since it uses less digits than its factorization.

997211320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17108 (or 17104 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 997211320 is about 31578.6529161711. The cubic root of 997211320 is about 999.0695745770.

The spelling of 997211320 in words is "nine hundred ninety-seven million, two hundred eleven thousand, three hundred twenty".