1405981100979 has 24 divisors (see below), whose sum is σ = 2499521958752. Its totient is φ = 741616404480.

The previous prime is 1405981100963. The next prime is 1405981100989. The reversal of 1405981100979 is 9790011895041.

1405981100979 is a `hidden beast` number, since 1 + 40 + 598 + 1 + 1 + 0 + 0 + 9 + 7 + 9 = 666.

It is not a de Polignac number, because 1405981100979 - 2⁴ = 1405981100963 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1405981100989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 858351502 + ... + 858353139.

Almost surely, 2^{1405981100979} is an apocalyptic number.

1405981100979 is a deficient number, since it is larger than the sum of its proper divisors (1093540857773).

1405981100979 is a wasteful number, since it uses less digits than its factorization.

1405981100979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716704667 (or 1716704664 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 54.

The spelling of 1405981100979 in words is "one trillion, four hundred five billion, nine hundred eighty-one million, one hundred thousand, nine hundred seventy-nine".