40006520 has 64 divisors (see below), whose sum is σ = 93078720. Its totient is φ = 15468544.

The previous prime is 40006517. The next prime is 40006537. The reversal of 40006520 is 2560004.

40006520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239477 + ... + 239643.

It is an arithmetic number, because the mean of its divisors is an integer number (1454355).

Almost surely, 2^40006520 is an apocalyptic number.

40006520 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 40006520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46539360).

40006520 is an abundant number, since it is smaller than the sum of its proper divisors (53072200).

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

40006520 is a wasteful number, since it uses less digits than its factorization.

40006520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 40006520 is about 6325.0707505924. The cubic root of 40006520 is about 342.0137700644.

Adding to 40006520 its reverse (2560004), we get a palindrome (42566524).

The spelling of 40006520 in words is "forty million, six thousand, five hundred twenty".