43640605 has 8 divisors (see below), whose sum is σ = 53646264. Its totient is φ = 34060800.

The previous prime is 43640573. The next prime is 43640609. The reversal of 43640605 is 50604634.

It can be written as a sum of positive squares in 4 ways, for example, as 1369 + 43639236 = 37^2 + 6606^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 43640605 - 2⁵ = 43640573 is a prime.

It is a super-3 number, since 3×43640605³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43640609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106236 + ... + 106645.

It is an arithmetic number, because the mean of its divisors is an integer number (6705783).

Almost surely, 2^43640605 is an apocalyptic number.

It is an amenable number.

43640605 is a deficient number, since it is larger than the sum of its proper divisors (10005659).

43640605 is a wasteful number, since it uses less digits than its factorization.

43640605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212927.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 43640605 is about 6606.1036171105. The cubic root of 43640605 is about 352.0710003344.

It can be divided in two parts, 436 and 40605, that added together give a triangular number (41041 = T₂₈₆).

The spelling of 43640605 in words is "forty-three million, six hundred forty thousand, six hundred five".