43979645 has 4 divisors (see below), whose sum is σ = 52775580. Its totient is φ = 35183712.

The previous prime is 43979599. The next prime is 43979681. The reversal of 43979645 is 54697934.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5067001 + 38912644 = 2251^2 + 6238^2 .

It is a cyclic number.

It is not a de Polignac number, because 43979645 - 2⁸ = 43979389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43979645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4397960 + ... + 4397969.

It is an arithmetic number, because the mean of its divisors is an integer number (13193895).

Almost surely, 2^43979645 is an apocalyptic number.

It is an amenable number.

43979645 is a deficient number, since it is larger than the sum of its proper divisors (8795935).

43979645 is an equidigital number, since it uses as much as digits as its factorization.

43979645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8795934.

The product of its digits is 816480, while the sum is 47.

The square root of 43979645 is about 6631.7150873662. The cubic root of 43979645 is about 352.9803855596.

The spelling of 43979645 in words is "forty-three million, nine hundred seventy-nine thousand, six hundred forty-five".