1381978364976 has 200 divisors, whose sum is σ = 4391268632784. Its totient is φ = 416113251840.

The previous prime is 1381978364971. The next prime is 1381978365041. The reversal of 1381978364976 is 6794638791831.

It is a happy number.

1381978364976 is a `hidden beast` number, since 1 + 3 + 8 + 197 + 8 + 364 + 9 + 76 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (1381978364971) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1929466 + ... + 2546918.

Almost surely, 2^{1381978364976} is an apocalyptic number.

1381978364976 is a gapful number since it is divisible by the number (16) 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 1381978364976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2195634316392).

1381978364976 is an abundant number, since it is smaller than the sum of its proper divisors (3009290267808).

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

1381978364976 is a wasteful number, since it uses less digits than its factorization.

1381978364976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617641 (or 617626 counting only the distinct ones).

The product of its digits is 329204736, while the sum is 72.

The spelling of 1381978364976 in words is "one trillion, three hundred eighty-one billion, nine hundred seventy-eight million, three hundred sixty-four thousand, nine hundred seventy-six".