1278401963 has 12 divisors (see below), whose sum is σ = 1335902760. Its totient is φ = 1223180640.

The previous prime is 1278401959. The next prime is 1278401987. The reversal of 1278401963 is 3691048721.

It is not a de Polignac number, because 1278401963 - 2² = 1278401959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1278401963.

It is not an unprimeable number, because it can be changed into a prime (1278401933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78056 + ... + 93002.

It is an arithmetic number, because the mean of its divisors is an integer number (111325230).

Almost surely, 2^1278401963 is an apocalyptic number.

1278401963 is a deficient number, since it is larger than the sum of its proper divisors (57500797).

1278401963 is an equidigital number, since it uses as much as digits as its factorization.

1278401963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15098 (or 15067 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 1278401963 is about 35754.7474190491. The cubic root of 1278401963 is about 1085.3150105742.

The spelling of 1278401963 in words is "one billion, two hundred seventy-eight million, four hundred one thousand, nine hundred sixty-three".