40006720 has 112 divisors (see below), whose sum is σ = 104973120. Its totient is φ = 14432256.

The previous prime is 40006717. The next prime is 40006739. The reversal of 40006720 is 2760004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245359 + ... + 245521.

It is an arithmetic number, because the mean of its divisors is an integer number (937260).

Almost surely, 2^40006720 is an apocalyptic number.

40006720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40006720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52486560).

40006720 is an abundant number, since it is smaller than the sum of its proper divisors (64966400).

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

40006720 is a wasteful number, since it uses less digits than its factorization.

40006720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 40006720 is about 6325.0865606725. The cubic root of 40006720 is about 342.0143399935.

Adding to 40006720 its reverse (2760004), we get a palindrome (42766724).

The spelling of 40006720 in words is "forty million, six thousand, seven hundred twenty".