8440140409 has 4 divisors (see below), whose sum is σ = 8442918900. Its totient is φ = 8437361920.

The previous prime is 8440140361. The next prime is 8440140469. The reversal of 8440140409 is 9040410448.

8440140409 is digitally balanced in base 3, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 7925984784 + 514155625 = 89028^2 + 22675^2 .

It is a cyclic number.

It is not a de Polignac number, because 8440140409 - 2²⁵ = 8406585977 is a prime.

It is a super-3 number, since 3×8440140409³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8440140469) 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, 1384684 + ... + 1390765.

It is an arithmetic number, because the mean of its divisors is an integer number (2110729725).

Almost surely, 2^8440140409 is an apocalyptic number.

It is an amenable number.

8440140409 is a deficient number, since it is larger than the sum of its proper divisors (2778491).

8440140409 is a wasteful number, since it uses less digits than its factorization.

8440140409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2778490.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 8440140409 is about 91870.2367962552. The cubic root of 8440140409 is about 2036.0255509709.

The spelling of 8440140409 in words is "eight billion, four hundred forty million, one hundred forty thousand, four hundred nine".