40405191 has 16 divisors (see below), whose sum is σ = 56918400. Its totient is φ = 25424928.

The previous prime is 40405187. The next prime is 40405217. The reversal of 40405191 is 19150404.

It is not a de Polignac number, because 40405191 - 2² = 40405187 is a prime.

It is a super-4 number, since 4×40405191⁴ (a number of 32 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40405171) 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, 16345 + ... + 18653.

It is an arithmetic number, because the mean of its divisors is an integer number (3557400).

Almost surely, 2^40405191 is an apocalyptic number.

40405191 is a deficient number, since it is larger than the sum of its proper divisors (16513209).

40405191 is a wasteful number, since it uses less digits than its factorization.

40405191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2638.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 40405191 is about 6356.5077676347. The cubic root of 40405191 is about 343.1460900239.

Adding to 40405191 its reverse (19150404), we get a palindrome (59555595).

The spelling of 40405191 in words is "forty million, four hundred five thousand, one hundred ninety-one".