7978381129 has 16 divisors (see below), whose sum is σ = 8641624320. Its totient is φ = 7337824000.

The previous prime is 7978381109. The next prime is 7978381153. The reversal of 7978381129 is 9211838797.

It is a cyclic number.

It is not a de Polignac number, because 7978381129 - 2⁷ = 7978381001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7978381129.

It is not an unprimeable number, because it can be changed into a prime (7978381109) 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 15 ways as a sum of consecutive naturals, for example, 208512 + ... + 243790.

It is an arithmetic number, because the mean of its divisors is an integer number (540101520).

Almost surely, 2^7978381129 is an apocalyptic number.

It is an amenable number.

7978381129 is a deficient number, since it is larger than the sum of its proper divisors (663243191).

7978381129 is a wasteful number, since it uses less digits than its factorization.

7978381129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35600.

The product of its digits is 1524096, while the sum is 55.

The square root of 7978381129 is about 89321.7841794486. The cubic root of 7978381129 is about 1998.1968021440.

The spelling of 7978381129 in words is "seven billion, nine hundred seventy-eight million, three hundred eighty-one thousand, one hundred twenty-nine".