997321842 has 32 divisors (see below), whose sum is σ = 2417751360. Its totient is φ = 302218560.

The previous prime is 997321823. The next prime is 997321849. The reversal of 997321842 is 248123799.

It is not an unprimeable number, because it can be changed into a prime (997321849) 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, 838903 + ... + 840090.

It is an arithmetic number, because the mean of its divisors is an integer number (75554730).

Almost surely, 2^997321842 is an apocalyptic number.

997321842 is an abundant number, since it is smaller than the sum of its proper divisors (1420429518).

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

997321842 is a wasteful number, since it uses less digits than its factorization.

997321842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679015 (or 1679009 counting only the distinct ones).

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

The square root of 997321842 is about 31580.4028156704. The cubic root of 997321842 is about 999.1064825310.

The spelling of 997321842 in words is "nine hundred ninety-seven million, three hundred twenty-one thousand, eight hundred forty-two".