1278131403 has 16 divisors (see below), whose sum is σ = 1725235200. Its totient is φ = 841579200.

The previous prime is 1278131401. The next prime is 1278131423. The reversal of 1278131403 is 3041318721.

It is not a de Polignac number, because 1278131403 - 2¹ = 1278131401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1278131401) 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 15 ways as a sum of consecutive naturals, for example, 305238 + ... + 309396.

It is an arithmetic number, because the mean of its divisors is an integer number (107827200).

Almost surely, 2^1278131403 is an apocalyptic number.

1278131403 is a deficient number, since it is larger than the sum of its proper divisors (447103797).

1278131403 is a wasteful number, since it uses less digits than its factorization.

1278131403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5402.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 1278131403 is about 35750.9636653336. The cubic root of 1278131403 is about 1085.2384400965.

The spelling of 1278131403 in words is "one billion, two hundred seventy-eight million, one hundred thirty-one thousand, four hundred three".