43956987409 has 4 divisors (see below), whose sum is σ = 43960379904. Its totient is φ = 43953594916.

The previous prime is 43956987391. The next prime is 43956987463. The reversal of 43956987409 is 90478965934.

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 43956987409 - 2⁹ = 43956986897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43956687409) 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, 1676737 + ... + 1702750.

It is an arithmetic number, because the mean of its divisors is an integer number (10990094976).

Almost surely, 2^43956987409 is an apocalyptic number.

It is an amenable number.

43956987409 is a deficient number, since it is larger than the sum of its proper divisors (3392495).

43956987409 is a wasteful number, since it uses less digits than its factorization.

43956987409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3392494.

The product of its (nonzero) digits is 58786560, while the sum is 64.

The spelling of 43956987409 in words is "forty-three billion, nine hundred fifty-six million, nine hundred eighty-seven thousand, four hundred nine".