8129979 has 24 divisors (see below), whose sum is σ = 13798512. Its totient is φ = 4547520.

The previous prime is 8129963. The next prime is 8129999. The reversal of 8129979 is 9799218.

It is not a de Polignac number, because 8129979 - 2⁴ = 8129963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8129909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1872 + ... + 4445.

It is an arithmetic number, because the mean of its divisors is an integer number (574938).

Almost surely, 2^8129979 is an apocalyptic number.

8129979 is a deficient number, since it is larger than the sum of its proper divisors (5668533).

8129979 is a wasteful number, since it uses less digits than its factorization.

8129979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6347 (or 6344 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 8129979 is about 2851.3118033635. The cubic root of 8129979 is about 201.0773445565.

The spelling of 8129979 in words is "eight million, one hundred twenty-nine thousand, nine hundred seventy-nine".