43897947509 has 8 divisors (see below), whose sum is σ = 47293972320. Its totient is φ = 40504674096.

The previous prime is 43897947493. The next prime is 43897947523. The reversal of 43897947509 is 90574979834.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43897947509 - 2⁴ = 43897947493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43897947559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 654647 + ... + 718580.

It is an arithmetic number, because the mean of its divisors is an integer number (5911746540).

Almost surely, 2^43897947509 is an apocalyptic number.

It is an amenable number.

43897947509 is a deficient number, since it is larger than the sum of its proper divisors (3396024811).

43897947509 is a wasteful number, since it uses less digits than its factorization.

43897947509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375699.

The product of its (nonzero) digits is 68584320, while the sum is 65.

The spelling of 43897947509 in words is "forty-three billion, eight hundred ninety-seven million, nine hundred forty-seven thousand, five hundred nine".