997831866 has 16 divisors (see below), whose sum is σ = 2018088000. Its totient is φ = 328873248.

The previous prime is 997831853. The next prime is 997831897. The reversal of 997831866 is 668138799.

It is an unprimeable number.

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, 933766 + ... + 934833.

It is an arithmetic number, because the mean of its divisors is an integer number (126130500).

Almost surely, 2^997831866 is an apocalyptic number.

997831866 is an abundant number, since it is smaller than the sum of its proper divisors (1020256134).

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

997831866 is a wasteful number, since it uses less digits than its factorization.

997831866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1868693.

The product of its digits is 3919104, while the sum is 57.

The square root of 997831866 is about 31588.4767913871. The cubic root of 997831866 is about 999.2767657250.

The spelling of 997831866 in words is "nine hundred ninety-seven million, eight hundred thirty-one thousand, eight hundred sixty-six".