43408621 has 8 divisors (see below), whose sum is σ = 45037080. Its totient is φ = 41788992.

The previous prime is 43408609. The next prime is 43408639. The reversal of 43408621 is 12680434.

It can be written as a sum of positive squares in 4 ways, for example, as 14356521 + 29052100 = 3789^2 + 5390^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 43408621 - 2⁹ = 43408109 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 43408621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43408661) 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, 8811 + ... + 12823.

It is an arithmetic number, because the mean of its divisors is an integer number (5629635).

Almost surely, 2^43408621 is an apocalyptic number.

It is an amenable number.

43408621 is a deficient number, since it is larger than the sum of its proper divisors (1628459).

43408621 is a wasteful number, since it uses less digits than its factorization.

43408621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4415.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 43408621 is about 6588.5219131456. The cubic root of 43408621 is about 351.4460472678.

The spelling of 43408621 in words is "forty-three million, four hundred eight thousand, six hundred twenty-one".