40947847 has 2 divisors, whose sum is σ = 40947848. Its totient is φ = 40947846.

The previous prime is 40947839. The next prime is 40947877. The reversal of 40947847 is 74874904.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40947847 - 2³ = 40947839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40947877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20473923 + 20473924.

It is an arithmetic number, because the mean of its divisors is an integer number (20473924).

Almost surely, 2^40947847 is an apocalyptic number.

40947847 is a deficient number, since it is larger than the sum of its proper divisors (1).

40947847 is an equidigital number, since it uses as much as digits as its factorization.

40947847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 40947847 is about 6399.0504764379. The cubic root of 40947847 is about 344.6754547870.

The spelling of 40947847 in words is "forty million, nine hundred forty-seven thousand, eight hundred forty-seven".