40205947 has 8 divisors (see below), whose sum is σ = 41094144. Its totient is φ = 39327528.

The previous prime is 40205941. The next prime is 40205981. The reversal of 40205947 is 74950204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40205947 - 2⁷ = 40205819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40205941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6198 + ... + 10900.

It is an arithmetic number, because the mean of its divisors is an integer number (5136768).

Almost surely, 2^40205947 is an apocalyptic number.

40205947 is a deficient number, since it is larger than the sum of its proper divisors (888197).

40205947 is a wasteful number, since it uses less digits than its factorization.

40205947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4889.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 40205947 is about 6340.8159569570. The cubic root of 40205947 is about 342.5811255783.

The spelling of 40205947 in words is "forty million, two hundred five thousand, nine hundred forty-seven".