40009860 has 144 divisors (see below), whose sum is σ = 134289792. Its totient is φ = 9641280.

The previous prime is 40009843. The next prime is 40009873. The reversal of 40009860 is 6890004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 239497 + ... + 239663.

It is an arithmetic number, because the mean of its divisors is an integer number (932568).

Almost surely, 2^40009860 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40009860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67144896).

40009860 is an abundant number, since it is smaller than the sum of its proper divisors (94279932).

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

40009860 is a wasteful number, since it uses less digits than its factorization.

40009860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 40009860 is about 6325.3347737491. The cubic root of 40009860 is about 342.0232876314.

Adding to 40009860 its reverse (6890004), we get a palindrome (46899864).

The spelling of 40009860 in words is "forty million, nine thousand, eight hundred sixty".