997864798 has 16 divisors (see below), whose sum is σ = 1785000960. Its totient is φ = 409062456.

The previous prime is 997864783. The next prime is 997864801. The reversal of 997864798 is 897468799.

It is a congruent number.

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, 1549158 + ... + 1549801.

It is an arithmetic number, because the mean of its divisors is an integer number (111562560).

Almost surely, 2^997864798 is an apocalyptic number.

997864798 is a deficient number, since it is larger than the sum of its proper divisors (787136162).

997864798 is a wasteful number, since it uses less digits than its factorization.

997864798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3098991.

The product of its digits is 54867456, while the sum is 67.

The square root of 997864798 is about 31588.9980531197. The cubic root of 997864798 is about 999.2877588330.

The spelling of 997864798 in words is "nine hundred ninety-seven million, eight hundred sixty-four thousand, seven hundred ninety-eight".