1280403139401 has 9 divisors (see below), whose sum is σ = 1849476104749. Its totient is φ = 853599829836.

The previous prime is 1280403139373. The next prime is 1280403139459. The reversal of 1280403139401 is 1049313040821.

The square root of 1280403139401 is 1131549.

It is a perfect power (a square), and thus also a powerful number.

1280403139401 is a `hidden beast` number, since 1 + 2 + 80 + 40 + 3 + 139 + 401 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1280403139401 - 2⁵ = 1280403139369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280403139501) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3206056 + ... + 3583238.

Almost surely, 2^{1280403139401} is an apocalyptic number.

1280403139401 is the 1131549-th square number.

1280403139401 is the 565775-th centered octagonal number.

It is an amenable number.

1280403139401 is a deficient number, since it is larger than the sum of its proper divisors (569072965348).

1280403139401 is an frugal number, since it uses more digits than its factorization.

1280403139401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754372 (or 377186 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

Multiplying 1280403139401 by its sum of digits (36), we get a square (46094513018436 = 6789294²).

The spelling of 1280403139401 in words is "one trillion, two hundred eighty billion, four hundred three million, one hundred thirty-nine thousand, four hundred one".