40440047 has 4 divisors (see below), whose sum is σ = 40459056. Its totient is φ = 40421040.

The previous prime is 40440019. The next prime is 40440077. The reversal of 40440047 is 74004404.

40440047 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40440047 - 2¹⁰ = 40439023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40440017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5843 + ... + 10724.

It is an arithmetic number, because the mean of its divisors is an integer number (10114764).

Almost surely, 2^40440047 is an apocalyptic number.

40440047 is a deficient number, since it is larger than the sum of its proper divisors (19009).

40440047 is a wasteful number, since it uses less digits than its factorization.

40440047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19008.

The product of its (nonzero) digits is 1792, while the sum is 23.

The square root of 40440047 is about 6359.2489336399. The cubic root of 40440047 is about 343.2447346297.

The spelling of 40440047 in words is "forty million, four hundred forty thousand, forty-seven".