40019986 has 8 divisors (see below), whose sum is σ = 60503040. Its totient is φ = 19852308.

The previous prime is 40019981. The next prime is 40020011. The reversal of 40019986 is 68991004.

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

It is not an unprimeable number, because it can be changed into a prime (40019981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78526 + ... + 79033.

It is an arithmetic number, because the mean of its divisors is an integer number (7562880).

Almost surely, 2^40019986 is an apocalyptic number.

40019986 is a deficient number, since it is larger than the sum of its proper divisors (20483054).

40019986 is a wasteful number, since it uses less digits than its factorization.

40019986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157688.

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

The square root of 40019986 is about 6326.1351550532. The cubic root of 40019986 is about 342.0521391502.

It can be divided in two parts, 4001998 and 6, that added together give a palindrome (4002004).

The spelling of 40019986 in words is "forty million, nineteen thousand, nine hundred eighty-six".