40043791 has 8 divisors (see below), whose sum is σ = 40503024. Its totient is φ = 39587520.

The previous prime is 40043777. The next prime is 40043797. The reversal of 40043791 is 19734004.

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 40043791 - 2¹³ = 40035599 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 (40043797) 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 7 ways as a sum of consecutive naturals, for example, 35955 + ... + 37051.

It is an arithmetic number, because the mean of its divisors is an integer number (5062878).

Almost surely, 2^40043791 is an apocalyptic number.

40043791 is a deficient number, since it is larger than the sum of its proper divisors (459233).

40043791 is a wasteful number, since it uses less digits than its factorization.

40043791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 40043791 is about 6328.0163558575. The cubic root of 40043791 is about 342.1199464139.

Adding to 40043791 its reverse (19734004), we get a palindrome (59777795).

The spelling of 40043791 in words is "forty million, forty-three thousand, seven hundred ninety-one".