40078838809 has 9 divisors (see below), whose sum is σ = 40478542741. Its totient is φ = 39683049340.

The previous prime is 40078838803. The next prime is 40078838819. The reversal of 40078838809 is 90883887004.

The square root of 40078838809 is 200197.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 40078838809 - 2²⁹ = 39541967897 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 40078838809.

It is not an unprimeable number, because it can be changed into a prime (40078838803) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 21420144 + ... + 21422014.

Almost surely, 2^40078838809 is an apocalyptic number.

40078838809 is the 200197-th square number.

40078838809 is the 100099-th centered octagonal number.

It is an amenable number.

40078838809 is a deficient number, since it is larger than the sum of its proper divisors (399703932).

40078838809 is an frugal number, since it uses more digits than its factorization.

40078838809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3956 (or 1978 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 55.

The spelling of 40078838809 in words is "forty billion, seventy-eight million, eight hundred thirty-eight thousand, eight hundred nine".