40391268909 has 4 divisors (see below), whose sum is σ = 53855025216. Its totient is φ = 26927512604.

The previous prime is 40391268901. The next prime is 40391269021. The reversal of 40391268909 is 90986219304.

40391268909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 40391268909 - 2³ = 40391268901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40391268901) 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, 6731878149 + ... + 6731878154.

It is an arithmetic number, because the mean of its divisors is an integer number (13463756304).

Almost surely, 2^40391268909 is an apocalyptic number.

It is an amenable number.

40391268909 is a deficient number, since it is larger than the sum of its proper divisors (13463756307).

40391268909 is a wasteful number, since it uses less digits than its factorization.

40391268909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13463756306.

The product of its (nonzero) digits is 839808, while the sum is 51.

The spelling of 40391268909 in words is "forty billion, three hundred ninety-one million, two hundred sixty-eight thousand, nine hundred nine".