43720005 has 48 divisors (see below), whose sum is σ = 86184000. Its totient is φ = 18805248.

The previous prime is 43719997. The next prime is 43720049. The reversal of 43720005 is 50002734.

It is a happy number.

43720005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 43720005 - 2³ = 43719997 is a prime.

It is a super-2 number, since 2×43720005² = 3822877674400050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 10746 + ... + 14244.

It is an arithmetic number, because the mean of its divisors is an integer number (1795500).

Almost surely, 2^43720005 is an apocalyptic number.

It is an amenable number.

43720005 is a deficient number, since it is larger than the sum of its proper divisors (42463995).

43720005 is a wasteful number, since it uses less digits than its factorization.

43720005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3538 (or 3531 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 43720005 is about 6612.1104800207. The cubic root of 43720005 is about 352.2843910596.

Adding to 43720005 its reverse (50002734), we get a palindrome (93722739).

The spelling of 43720005 in words is "forty-three million, seven hundred twenty thousand, five".