43909873 has 4 divisors (see below), whose sum is σ = 50182720. Its totient is φ = 37637028.

The previous prime is 43909867. The next prime is 43909897. The reversal of 43909873 is 37890934.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43909873 - 2¹³ = 43901681 is a prime.

It is a super-2 number, since 2×43909873² = 3856153893752258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (43909823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3136413 + ... + 3136426.

It is an arithmetic number, because the mean of its divisors is an integer number (12545680).

Almost surely, 2^43909873 is an apocalyptic number.

It is an amenable number.

43909873 is a deficient number, since it is larger than the sum of its proper divisors (6272847).

43909873 is an equidigital number, since it uses as much as digits as its factorization.

43909873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6272846.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 43909873 is about 6626.4525200140. The cubic root of 43909873 is about 352.7936235335.

The spelling of 43909873 in words is "forty-three million, nine hundred nine thousand, eight hundred seventy-three".