40045986 has 48 divisors (see below), whose sum is σ = 91703040. Its totient is φ = 12610080.

The previous prime is 40045933. The next prime is 40045987. The reversal of 40045986 is 68954004.

It is a self number, because there is not a number n which added to its sum of digits gives 40045986.

It is not an unprimeable number, because it can be changed into a prime (40045987) 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 23 ways as a sum of consecutive naturals, for example, 23160 + ... + 24828.

It is an arithmetic number, because the mean of its divisors is an integer number (1910480).

Almost surely, 2^40045986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40045986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45851520).

40045986 is an abundant number, since it is smaller than the sum of its proper divisors (51657054).

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

40045986 is a wasteful number, since it uses less digits than its factorization.

40045986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751 (or 1748 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 40045986 is about 6328.1897885572. The cubic root of 40045986 is about 342.1261974002.

The spelling of 40045986 in words is "forty million, forty-five thousand, nine hundred eighty-six".