40047718 has 4 divisors (see below), whose sum is σ = 60071580. Its totient is φ = 20023858.

The previous prime is 40047697. The next prime is 40047731. The reversal of 40047718 is 81774004.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 40047718.

It is a congruent number.

It is an unprimeable number.

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, 10011928 + ... + 10011931.

It is an arithmetic number, because the mean of its divisors is an integer number (15017895).

Almost surely, 2^40047718 is an apocalyptic number.

40047718 is a deficient number, since it is larger than the sum of its proper divisors (20023862).

40047718 is a wasteful number, since it uses less digits than its factorization.

40047718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20023861.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 40047718 is about 6328.3266350592. The cubic root of 40047718 is about 342.1311296800.

The spelling of 40047718 in words is "forty million, forty-seven thousand, seven hundred eighteen".