7978949129 has 8 divisors (see below), whose sum is σ = 8513948640. Its totient is φ = 7455455136.

The previous prime is 7978949119. The next prime is 7978949141. The reversal of 7978949129 is 9219498797.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7978949129 - 2²⁴ = 7962171913 is a prime.

It is a super-3 number, since 3×7978949129³ (a number of 31 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (7978949119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2874947 + ... + 2877720.

It is an arithmetic number, because the mean of its divisors is an integer number (1064243580).

Almost surely, 2^7978949129 is an apocalyptic number.

It is an amenable number.

7978949129 is a deficient number, since it is larger than the sum of its proper divisors (534999511).

7978949129 is a wasteful number, since it uses less digits than its factorization.

7978949129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5752759.

The product of its digits is 20575296, while the sum is 65.

The square root of 7978949129 is about 89324.9636383917. The cubic root of 7978949129 is about 1998.2442198190.

The spelling of 7978949129 in words is "seven billion, nine hundred seventy-eight million, nine hundred forty-nine thousand, one hundred twenty-nine".