43139979 has 8 divisors (see below), whose sum is σ = 63911120. Its totient is φ = 28759968.

The previous prime is 43139977. The next prime is 43139983. The reversal of 43139979 is 97993134.

It is not a de Polignac number, because 43139979 - 2¹ = 43139977 is a prime.

It is a super-2 number, since 2×43139979² = 3722115576240882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43139977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 798862 + ... + 798915.

It is an arithmetic number, because the mean of its divisors is an integer number (7988890).

Almost surely, 2^43139979 is an apocalyptic number.

43139979 is a deficient number, since it is larger than the sum of its proper divisors (20771141).

43139979 is a wasteful number, since it uses less digits than its factorization.

43139979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597786 (or 1597780 counting only the distinct ones).

The product of its digits is 183708, while the sum is 45.

The square root of 43139979 is about 6568.1031508343. The cubic root of 43139979 is about 350.7195509827.

The spelling of 43139979 in words is "forty-three million, one hundred thirty-nine thousand, nine hundred seventy-nine".