40478429 has 2 divisors, whose sum is σ = 40478430. Its totient is φ = 40478428.

The previous prime is 40478423. The next prime is 40478447. The reversal of 40478429 is 92487404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36060025 + 4418404 = 6005^2 + 2102^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40478429 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40478392 and 40478401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40478423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20239214 + 20239215.

It is an arithmetic number, because the mean of its divisors is an integer number (20239215).

Almost surely, 2^40478429 is an apocalyptic number.

It is an amenable number.

40478429 is a deficient number, since it is larger than the sum of its proper divisors (1).

40478429 is an equidigital number, since it uses as much as digits as its factorization.

40478429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 40478429 is about 6362.2660271322. The cubic root of 40478429 is about 343.3532924793.

The spelling of 40478429 in words is "forty million, four hundred seventy-eight thousand, four hundred twenty-nine".