40478721369 has 8 divisors (see below), whose sum is σ = 57146430240. Its totient is φ = 25398413376.

The previous prime is 40478721347. The next prime is 40478721383. The reversal of 40478721369 is 96312787404.

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

It is not a de Polignac number, because 40478721369 - 2⁵ = 40478721337 is a prime.

It is a super-2 number, since 2×40478721369² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 793700419 = 40478721369 / (4 + 0 + 4 + 7 + 8 + 7 + 2 + 1 + 3 + 6 + 9).

It is not an unprimeable number, because it can be changed into a prime (40478720369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396850159 + ... + 396850260.

It is an arithmetic number, because the mean of its divisors is an integer number (7143303780).

Almost surely, 2^40478721369 is an apocalyptic number.

It is an amenable number.

40478721369 is a deficient number, since it is larger than the sum of its proper divisors (16667708871).

40478721369 is a wasteful number, since it uses less digits than its factorization.

40478721369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793700439.

The product of its (nonzero) digits is 2032128, while the sum is 51.

The spelling of 40478721369 in words is "forty billion, four hundred seventy-eight million, seven hundred twenty-one thousand, three hundred sixty-nine".