1380640128427 has 32 divisors (see below), whose sum is σ = 1614744668160. Its totient is φ = 1156064279040.

The previous prime is 1380640128403. The next prime is 1380640128457. The reversal of 1380640128427 is 7248210460831.

It is a cyclic number.

It is not a de Polignac number, because 1380640128427 - 2¹⁹ = 1380639604139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1380640128457) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66748527 + ... + 66769207.

It is an arithmetic number, because the mean of its divisors is an integer number (50460770880).

Almost surely, 2^{1380640128427} is an apocalyptic number.

1380640128427 is a deficient number, since it is larger than the sum of its proper divisors (234104539733).

1380640128427 is a wasteful number, since it uses less digits than its factorization.

1380640128427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21931.

The product of its (nonzero) digits is 516096, while the sum is 46.

The spelling of 1380640128427 in words is "one trillion, three hundred eighty billion, six hundred forty million, one hundred twenty-eight thousand, four hundred twenty-seven".