40099986 has 12 divisors (see below), whose sum is σ = 86883342. Its totient is φ = 13366656.

The previous prime is 40099981. The next prime is 40099987. The reversal of 40099986 is 68999004.

It can be written as a sum of positive squares in only one way, i.e., 37638225 + 2461761 = 6135^2 + 1569^2 .

It is not an unprimeable number, because it can be changed into a prime (40099981) 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 5 ways as a sum of consecutive naturals, for example, 1113871 + ... + 1113906.

Almost surely, 2^40099986 is an apocalyptic number.

40099986 is an abundant number, since it is smaller than the sum of its proper divisors (46783356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40099986 is a wasteful number, since it uses less digits than its factorization.

40099986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2227785 (or 2227782 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 40099986 is about 6332.4549741787. The cubic root of 40099986 is about 342.2799083260.

The spelling of 40099986 in words is "forty million, ninety-nine thousand, nine hundred eighty-six".