1280403139402 has 16 divisors (see below), whose sum is σ = 1924381938024. Its totient is φ = 638943480000.

The previous prime is 1280403139373. The next prime is 1280403139459. The reversal of 1280403139402 is 2049313040821.

It is a Cunningham number, because it is equal to 1131549²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1132161968961 + 148241170441 = 1064031^2 + 385021^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2363752 + ... + 2854492.

Almost surely, 2^{1280403139402} is an apocalyptic number.

1280403139402 is a deficient number, since it is larger than the sum of its proper divisors (643978798622).

1280403139402 is a wasteful number, since it uses less digits than its factorization.

1280403139402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493305.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 1280403139402 in words is "one trillion, two hundred eighty billion, four hundred three million, one hundred thirty-nine thousand, four hundred two".