40004047 has 2 divisors, whose sum is σ = 40004048. Its totient is φ = 40004046.

The previous prime is 40004039. The next prime is 40004051. The reversal of 40004047 is 74040004.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40004047 - 2³ = 40004039 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40004017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20002023 + 20002024.

It is an arithmetic number, because the mean of its divisors is an integer number (20002024).

Almost surely, 2^40004047 is an apocalyptic number.

40004047 is a deficient number, since it is larger than the sum of its proper divisors (1).

40004047 is an equidigital number, since it uses as much as digits as its factorization.

40004047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 19.

The square root of 40004047 is about 6324.8752556869. The cubic root of 40004047 is about 342.0067227341.

The spelling of 40004047 in words is "forty million, four thousand, forty-seven".