40209847 has 2 divisors, whose sum is σ = 40209848. Its totient is φ = 40209846.

The previous prime is 40209761. The next prime is 40209853. The reversal of 40209847 is 74890204.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40209847 - 2¹⁹ = 39685559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40209887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20104923 + 20104924.

It is an arithmetic number, because the mean of its divisors is an integer number (20104924).

Almost surely, 2^40209847 is an apocalyptic number.

40209847 is a deficient number, since it is larger than the sum of its proper divisors (1).

40209847 is an equidigital number, since it uses as much as digits as its factorization.

40209847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 40209847 is about 6341.1234808983. The cubic root of 40209847 is about 342.5922020756.

The spelling of 40209847 in words is "forty million, two hundred nine thousand, eight hundred forty-seven".