40091986 has 16 divisors (see below), whose sum is σ = 65730528. Its totient is φ = 18188800.

The previous prime is 40091981. The next prime is 40091993. The reversal of 40091986 is 68919004.

It is not an unprimeable number, because it can be changed into a prime (40091981) 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 7 ways as a sum of consecutive naturals, for example, 12681 + ... + 15523.

It is an arithmetic number, because the mean of its divisors is an integer number (4108158).

Almost surely, 2^40091986 is an apocalyptic number.

40091986 is a deficient number, since it is larger than the sum of its proper divisors (25638542).

40091986 is a wasteful number, since it uses less digits than its factorization.

40091986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3497.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 40091986 is about 6331.8232761188. The cubic root of 40091986 is about 342.2571450481.

It can be divided in two parts, 4009 and 1986, that added together give a palindrome (5995).

The spelling of 40091986 in words is "forty million, ninety-one thousand, nine hundred eighty-six".