40040091 has 24 divisors (see below), whose sum is σ = 71183840. Its totient is φ = 21119616.

The previous prime is 40040041. The next prime is 40040093. The reversal of 40040091 is 19004004.

It is not a de Polignac number, because 40040091 - 2⁶ = 40040027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40040093) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23626 + ... + 25263.

Almost surely, 2^40040091 is an apocalyptic number.

40040091 is a deficient number, since it is larger than the sum of its proper divisors (31143749).

40040091 is a wasteful number, since it uses less digits than its factorization.

40040091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48915 (or 48912 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 40040091 is about 6327.7239984057. The cubic root of 40040091 is about 342.1094089268.

Adding to 40040091 its reverse (19004004), we get a palindrome (59044095).

The spelling of 40040091 in words is "forty million, forty thousand, ninety-one".