997291866 has 16 divisors (see below), whose sum is σ = 2007972000. Its totient is φ = 330199248.

The previous prime is 997291861. The next prime is 997291873. The reversal of 997291866 is 668192799.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (997291861) 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 7 ways as a sum of consecutive naturals, for example, 556876 + ... + 558663.

It is an arithmetic number, because the mean of its divisors is an integer number (125498250).

Almost surely, 2^997291866 is an apocalyptic number.

997291866 is an abundant number, since it is smaller than the sum of its proper divisors (1010680134).

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

997291866 is a wasteful number, since it uses less digits than its factorization.

997291866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115693.

The product of its digits is 2939328, while the sum is 57.

The square root of 997291866 is about 31579.9282139779. The cubic root of 997291866 is about 999.0964725507.

The spelling of 997291866 in words is "nine hundred ninety-seven million, two hundred ninety-one thousand, eight hundred sixty-six".