1391278890128 has 20 divisors (see below), whose sum is σ = 2695987110960. Its totient is φ = 695540280864.

The previous prime is 1391278890047. The next prime is 1391278890137. The reversal of 1391278890128 is 8210988721931.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6081950 + ... + 6306557.

It is an arithmetic number, because the mean of its divisors is an integer number (134799355548).

Almost surely, 2^{1391278890128} is an apocalyptic number.

It is an amenable number.

1391278890128 is a deficient number, since it is larger than the sum of its proper divisors (1304708220832).

1391278890128 is a wasteful number, since it uses less digits than its factorization.

1391278890128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12395534 (or 12395528 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 59.

The spelling of 1391278890128 in words is "one trillion, three hundred ninety-one billion, two hundred seventy-eight million, eight hundred ninety thousand, one hundred twenty-eight".