40478447 has 2 divisors, whose sum is σ = 40478448. Its totient is φ = 40478446.

The previous prime is 40478429. The next prime is 40478489. The reversal of 40478447 is 74487404.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40478447 - 2¹⁴ = 40462063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40478447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40478497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20239223 + 20239224.

It is an arithmetic number, because the mean of its divisors is an integer number (20239224).

Almost surely, 2^40478447 is an apocalyptic number.

40478447 is a deficient number, since it is larger than the sum of its proper divisors (1).

40478447 is an equidigital number, since it uses as much as digits as its factorization.

40478447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100352, while the sum is 38.

The square root of 40478447 is about 6362.2674417223. The cubic root of 40478447 is about 343.3533433735.

The spelling of 40478447 in words is "forty million, four hundred seventy-eight thousand, four hundred forty-seven".