40017947 has 2 divisors, whose sum is σ = 40017948. Its totient is φ = 40017946.

The previous prime is 40017899. The next prime is 40017959. The reversal of 40017947 is 74971004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40017947 - 2¹⁰ = 40016923 is a prime.

It is equal to p_2434676 and since 40017947 and 2434676 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (40017347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20008973 + 20008974.

It is an arithmetic number, because the mean of its divisors is an integer number (20008974).

Almost surely, 2^40017947 is an apocalyptic number.

40017947 is a deficient number, since it is larger than the sum of its proper divisors (1).

40017947 is an equidigital number, since it uses as much as digits as its factorization.

40017947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 40017947 is about 6325.9739961527. The cubic root of 40017947 is about 342.0463299181.

The spelling of 40017947 in words is "forty million, seventeen thousand, nine hundred forty-seven".