40001999986 has 32 divisors (see below), whose sum is σ = 65491902000. Its totient is φ = 18213888000.

The previous prime is 40001999977. The next prime is 40001999987. The reversal of 40001999986 is 68999910004.

It can be written as a sum of positive squares in 8 ways, for example, as 13524527025 + 26477472961 = 116295^2 + 162719^2 .

It is not an unprimeable number, because it can be changed into a prime (40001999987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1019736 + ... + 1058236.

Almost surely, 2^40001999986 is an apocalyptic number.

40001999986 is a deficient number, since it is larger than the sum of its proper divisors (25489902014).

40001999986 is a wasteful number, since it uses less digits than its factorization.

40001999986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39054.

The product of its (nonzero) digits is 1259712, while the sum is 55.

It can be divided in two parts, 400019 and 99986, that added together give a palindrome (500005).

The spelling of 40001999986 in words is "forty billion, one million, nine hundred ninety-nine thousand, nine hundred eighty-six".