40047645 has 16 divisors (see below), whose sum is σ = 69901632. Its totient is φ = 19416960.

The previous prime is 40047641. The next prime is 40047661. The reversal of 40047645 is 54674004.

It is not a de Polignac number, because 40047645 - 2² = 40047641 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40047641) 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 in 15 ways as a sum of consecutive naturals, for example, 121192 + ... + 121521.

It is an arithmetic number, because the mean of its divisors is an integer number (4368852).

Almost surely, 2^40047645 is an apocalyptic number.

It is an amenable number.

40047645 is a deficient number, since it is larger than the sum of its proper divisors (29853987).

40047645 is a wasteful number, since it uses less digits than its factorization.

40047645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242732.

The product of its (nonzero) digits is 13440, while the sum is 30.

The square root of 40047645 is about 6328.3208673391. The cubic root of 40047645 is about 342.1309217981.

The spelling of 40047645 in words is "forty million, forty-seven thousand, six hundred forty-five".