43872409 has 16 divisors (see below), whose sum is σ = 52089856. Its totient is φ = 36158400.

The previous prime is 43872379. The next prime is 43872467. The reversal of 43872409 is 90427834.

It is a happy number.

43872409 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 43872409 - 2⁵ = 43872377 is a prime.

It is a super-3 number, since 3×43872409³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (43872209) 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 15 ways as a sum of consecutive naturals, for example, 38719 + ... + 39835.

It is an arithmetic number, because the mean of its divisors is an integer number (3255616).

Almost surely, 2^43872409 is an apocalyptic number.

It is an amenable number.

43872409 is a deficient number, since it is larger than the sum of its proper divisors (8217447).

43872409 is a wasteful number, since it uses less digits than its factorization.

43872409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 43872409 is about 6623.6250648720. The cubic root of 43872409 is about 352.6932602201.

The spelling of 43872409 in words is "forty-three million, eight hundred seventy-two thousand, four hundred nine".