1278905441 has 16 divisors (see below), whose sum is σ = 1435959360. Its totient is φ = 1128966720.

The previous prime is 1278905431. The next prime is 1278905479. The reversal of 1278905441 is 1445098721.

It is not a de Polignac number, because 1278905441 - 2³⁰ = 205163617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1278905401) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 74015 + ... + 89643.

It is an arithmetic number, because the mean of its divisors is an integer number (89747460).

Almost surely, 2^1278905441 is an apocalyptic number.

1278905441 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1278905441 is a deficient number, since it is larger than the sum of its proper divisors (157053919).

1278905441 is a wasteful number, since it uses less digits than its factorization.

1278905441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15856.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 1278905441 is about 35761.7874413458. The cubic root of 1278905441 is about 1085.4574698131.

It can be divided in two parts, 127890 and 5441, that added together give a palindrome (133331).

The spelling of 1278905441 in words is "one billion, two hundred seventy-eight million, nine hundred five thousand, four hundred forty-one".