43129979 has 4 divisors (see below), whose sum is σ = 43415760. Its totient is φ = 42844200.

The previous prime is 43129951. The next prime is 43130027. The reversal of 43129979 is 97992134.

43129979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 43129979 - 2¹² = 43125883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43129949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142664 + ... + 142965.

It is an arithmetic number, because the mean of its divisors is an integer number (10853940).

Almost surely, 2^43129979 is an apocalyptic number.

43129979 is a deficient number, since it is larger than the sum of its proper divisors (285781).

43129979 is a wasteful number, since it uses less digits than its factorization.

43129979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285780.

The product of its digits is 122472, while the sum is 44.

The square root of 43129979 is about 6567.3418519215. The cubic root of 43129979 is about 350.6924495436.

The spelling of 43129979 in words is "forty-three million, one hundred twenty-nine thousand, nine hundred seventy-nine".