1997329278 has 48 divisors (see below), whose sum is σ = 4699121040. Its totient is φ = 564246144.

The previous prime is 1997329253. The next prime is 1997329331. The reversal of 1997329278 is 8729237991.

It is a Curzon number.

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 23 ways as a sum of consecutive naturals, for example, 12001 + ... + 64332.

It is an arithmetic number, because the mean of its divisors is an integer number (97898355).

Almost surely, 2^1997329278 is an apocalyptic number.

1997329278 is an abundant number, since it is smaller than the sum of its proper divisors (2701791762).

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

1997329278 is a wasteful number, since it uses less digits than its factorization.

1997329278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76441 (or 76434 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 57.

The square root of 1997329278 is about 44691.4899953000. The cubic root of 1997329278 is about 1259.3599836010.

The spelling of 1997329278 in words is "one billion, nine hundred ninety-seven million, three hundred twenty-nine thousand, two hundred seventy-eight".