1278128103 has 16 divisors (see below), whose sum is σ = 1987372800. Its totient is φ = 730358328.

The previous prime is 1278128099. The next prime is 1278128129. The reversal of 1278128103 is 3018218721.

It is not a de Polignac number, because 1278128103 - 2² = 1278128099 is a prime.

It is a super-2 number, since 2×1278128103² = 3267222895356757218, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278128143) 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 15 ways as a sum of consecutive naturals, for example, 620025 + ... + 622082.

It is an arithmetic number, because the mean of its divisors is an integer number (124210800).

Almost surely, 2^1278128103 is an apocalyptic number.

1278128103 is a deficient number, since it is larger than the sum of its proper divisors (709244697).

1278128103 is an equidigital number, since it uses as much as digits as its factorization.

1278128103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242131 (or 1242117 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 1278128103 is about 35750.9175127017. The cubic root of 1278128103 is about 1085.2375061054.

The spelling of 1278128103 in words is "one billion, two hundred seventy-eight million, one hundred twenty-eight thousand, one hundred three".