1278896198 has 16 divisors (see below), whose sum is σ = 1946007600. Its totient is φ = 630239616.

The previous prime is 1278896189. The next prime is 1278896219. The reversal of 1278896198 is 8916988721.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309953 + ... + 314051.

It is an arithmetic number, because the mean of its divisors is an integer number (121625475).

Almost surely, 2^1278896198 is an apocalyptic number.

1278896198 is a deficient number, since it is larger than the sum of its proper divisors (667111402).

1278896198 is a wasteful number, since it uses less digits than its factorization.

1278896198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6311.

The product of its digits is 3483648, while the sum is 59.

The square root of 1278896198 is about 35761.6582109946. The cubic root of 1278896198 is about 1085.4548548407.

The spelling of 1278896198 in words is "one billion, two hundred seventy-eight million, eight hundred ninety-six thousand, one hundred ninety-eight".