997312178 has 16 divisors (see below), whose sum is σ = 1518004800. Its totient is φ = 491358000.

The previous prime is 997312163. The next prime is 997312189. The reversal of 997312178 is 871213799.

It is a super-3 number, since 3×997312178³ (a number of 28 digits) contains 333 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 7 ways as a sum of consecutive naturals, for example, 30923 + ... + 54321.

It is an arithmetic number, because the mean of its divisors is an integer number (94875300).

Almost surely, 2^997312178 is an apocalyptic number.

997312178 is a deficient number, since it is larger than the sum of its proper divisors (520692622).

997312178 is a wasteful number, since it uses less digits than its factorization.

997312178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23713.

The product of its digits is 190512, while the sum is 47.

The square root of 997312178 is about 31580.2498090183. The cubic root of 997312178 is about 999.1032554229.

The spelling of 997312178 in words is "nine hundred ninety-seven million, three hundred twelve thousand, one hundred seventy-eight".