1387999653768 has 256 divisors, whose sum is σ = 4769157120000. Its totient is φ = 364225289472.

The previous prime is 1387999653653. The next prime is 1387999653839. The reversal of 1387999653768 is 8673569997831.

1387999653768 is a `hidden beast` number, since 1 + 3 + 8 + 79 + 9 + 9 + 6 + 537 + 6 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3734121 + ... + 4088967.

It is an arithmetic number, because the mean of its divisors is an integer number (18629520000).

Almost surely, 2^{1387999653768} is an apocalyptic number.

1387999653768 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1387999653768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2384578560000).

1387999653768 is an abundant number, since it is smaller than the sum of its proper divisors (3381157466232).

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

1387999653768 is a wasteful number, since it uses less digits than its factorization.

1387999653768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355081 (or 355071 counting only the distinct ones).

The product of its digits is 3703553280, while the sum is 81.

The spelling of 1387999653768 in words is "one trillion, three hundred eighty-seven billion, nine hundred ninety-nine million, six hundred fifty-three thousand, seven hundred sixty-eight".