40440477509 has 4 divisors (see below), whose sum is σ = 40445049216. Its totient is φ = 40435905804.

The previous prime is 40440477491. The next prime is 40440477521. The reversal of 40440477509 is 90577404404.

40440477509 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 40440477509 - 2¹² = 40440473413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40440477509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40440477569) 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, 2272559 + ... + 2290284.

It is an arithmetic number, because the mean of its divisors is an integer number (10111262304).

Almost surely, 2^40440477509 is an apocalyptic number.

It is an amenable number.

40440477509 is a deficient number, since it is larger than the sum of its proper divisors (4571707).

40440477509 is an equidigital number, since it uses as much as digits as its factorization.

40440477509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4571706.

The product of its (nonzero) digits is 564480, while the sum is 44.

The spelling of 40440477509 in words is "forty billion, four hundred forty million, four hundred seventy-seven thousand, five hundred nine".