40131999 has 12 divisors (see below), whose sum is σ = 58024512. Its totient is φ = 26728800.

The previous prime is 40131997. The next prime is 40132003. The reversal of 40131999 is 99913104.

It is not a de Polignac number, because 40131999 - 2¹ = 40131997 is a prime.

It is a super-2 number, since 2×40131999² = 3221154687472002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40131997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14194 + ... + 16784.

It is an arithmetic number, because the mean of its divisors is an integer number (4835376).

Almost surely, 2^40131999 is an apocalyptic number.

40131999 is a deficient number, since it is larger than the sum of its proper divisors (17892513).

40131999 is a wasteful number, since it uses less digits than its factorization.

40131999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4318 (or 4315 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 40131999 is about 6334.9821625637. The cubic root of 40131999 is about 342.3709681427.

It can be divided in two parts, 401 and 31999, that added together give a square (32400 = 180²).

The spelling of 40131999 in words is "forty million, one hundred thirty-one thousand, nine hundred ninety-nine".