1391811137928 has 64 divisors (see below), whose sum is σ = 4034235196800. Its totient is φ = 443765868480.

The previous prime is 1391811137903. The next prime is 1391811137939. The reversal of 1391811137928 is 8297311181931.

1391811137928 is a `hidden beast` number, since 139 + 1 + 8 + 111 + 379 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140072643 + ... + 140082578.

It is an arithmetic number, because the mean of its divisors is an integer number (63034924950).

Almost surely, 2^{1391811137928} is an apocalyptic number.

1391811137928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1391811137928 is an abundant number, since it is smaller than the sum of its proper divisors (2642424058872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1391811137928 is a wasteful number, since it uses less digits than its factorization.

1391811137928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280155259 (or 280155249 counting only the distinct ones).

The product of its digits is 653184, while the sum is 54.

The spelling of 1391811137928 in words is "one trillion, three hundred ninety-one billion, eight hundred eleven million, one hundred thirty-seven thousand, nine hundred twenty-eight".