43138423309 has 4 divisors (see below), whose sum is σ = 43139565504. Its totient is φ = 43137281116.

The previous prime is 43138423277. The next prime is 43138423337. The reversal of 43138423309 is 90332483134.

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 43138423309 - 2⁵ = 43138423277 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43138423379) 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, 512437 + ... + 590650.

It is an arithmetic number, because the mean of its divisors is an integer number (10784891376).

Almost surely, 2^43138423309 is an apocalyptic number.

It is an amenable number.

43138423309 is a deficient number, since it is larger than the sum of its proper divisors (1142195).

43138423309 is a wasteful number, since it uses less digits than its factorization.

43138423309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142194.

The product of its (nonzero) digits is 186624, while the sum is 40.

The spelling of 43138423309 in words is "forty-three billion, one hundred thirty-eight million, four hundred twenty-three thousand, three hundred nine".