40808391 has 8 divisors (see below), whose sum is σ = 58596720. Its totient is φ = 25112832.

The previous prime is 40808377. The next prime is 40808393. The reversal of 40808391 is 19380804.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40808391 - 2⁵ = 40808359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40808393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 523146 + ... + 523223.

It is an arithmetic number, because the mean of its divisors is an integer number (7324590).

Almost surely, 2^40808391 is an apocalyptic number.

40808391 is a deficient number, since it is larger than the sum of its proper divisors (17788329).

40808391 is a wasteful number, since it uses less digits than its factorization.

40808391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046385.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 40808391 is about 6388.1445663041. The cubic root of 40808391 is about 344.2837229091.

The spelling of 40808391 in words is "forty million, eight hundred eight thousand, three hundred ninety-one".