43979399 has 4 divisors (see below), whose sum is σ = 45495960. Its totient is φ = 42462840.

The previous prime is 43979393. The next prime is 43979413. The reversal of 43979399 is 99397934.

43979399 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, and also an emirpimes, since its reverse is a distinct semiprime: 99397934 = 2 ⋅49698967.

It is a cyclic number.

It is not a de Polignac number, because 43979399 - 2¹² = 43975303 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 43979399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43979393) 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, 758237 + ... + 758294.

It is an arithmetic number, because the mean of its divisors is an integer number (11373990).

Almost surely, 2^43979399 is an apocalyptic number.

43979399 is a deficient number, since it is larger than the sum of its proper divisors (1516561).

43979399 is a wasteful number, since it uses less digits than its factorization.

43979399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1516560.

The product of its digits is 1653372, while the sum is 53.

The square root of 43979399 is about 6631.6965401019. The cubic root of 43979399 is about 352.9797274268.

The spelling of 43979399 in words is "forty-three million, nine hundred seventy-nine thousand, three hundred ninety-nine".