997991214 has 32 divisors (see below), whose sum is σ = 2228079744. Its totient is φ = 295387680.

The previous prime is 997991213. The next prime is 997991221. The reversal of 997991214 is 412199799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997991213) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 172989 + ... + 178664.

It is an arithmetic number, because the mean of its divisors is an integer number (69627492).

Almost surely, 2^997991214 is an apocalyptic number.

997991214 is an abundant number, since it is smaller than the sum of its proper divisors (1230088530).

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

997991214 is a wasteful number, since it uses less digits than its factorization.

997991214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351712.

The product of its digits is 367416, while the sum is 51.

The square root of 997991214 is about 31590.9989395714. The cubic root of 997991214 is about 999.3299558077.

The spelling of 997991214 in words is "nine hundred ninety-seven million, nine hundred ninety-one thousand, two hundred fourteen".