43620749 has 4 divisors (see below), whose sum is σ = 44443836. Its totient is φ = 42797664.

The previous prime is 43620737. The next prime is 43620763. The reversal of 43620749 is 94702634.

43620749 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.

It can be written as a sum of positive squares in 2 ways, for example, as 15721225 + 27899524 = 3965^2 + 5282^2 .

It is a cyclic number.

It is not a de Polignac number, because 43620749 - 2¹² = 43616653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43620779) 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, 411464 + ... + 411569.

It is an arithmetic number, because the mean of its divisors is an integer number (11110959).

Almost surely, 2^43620749 is an apocalyptic number.

It is an amenable number.

43620749 is a deficient number, since it is larger than the sum of its proper divisors (823087).

43620749 is an equidigital number, since it uses as much as digits as its factorization.

43620749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823086.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 43620749 is about 6604.6005935257. The cubic root of 43620749 is about 352.0175960772.

The spelling of 43620749 in words is "forty-three million, six hundred twenty thousand, seven hundred forty-nine".