40000191 has 32 divisors (see below), whose sum is σ = 68057088. Its totient is φ = 20291040.

The previous prime is 40000183. The next prime is 40000211. The reversal of 40000191 is 19100004.

It is not a de Polignac number, because 40000191 - 2³ = 40000183 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40000191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40000291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7920 + ... + 11946.

It is an arithmetic number, because the mean of its divisors is an integer number (2126784).

Almost surely, 2^40000191 is an apocalyptic number.

40000191 is a deficient number, since it is larger than the sum of its proper divisors (28056897).

40000191 is a wasteful number, since it uses less digits than its factorization.

40000191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4091.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 40000191 is about 6324.5704201946. The cubic root of 40000191 is about 341.9957336768.

Adding to 40000191 its reverse (19100004), we get a palindrome (59100195).

The spelling of 40000191 in words is "forty million, one hundred ninety-one", and thus it is an aban number.