40065640 has 64 divisors (see below), whose sum is σ = 94464000. Its totient is φ = 15275520.

The previous prime is 40065631. The next prime is 40065659. The reversal of 40065640 is 4656004.

It is a happy 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, 97756 + ... + 98164.

It is an arithmetic number, because the mean of its divisors is an integer number (1476000).

Almost surely, 2^40065640 is an apocalyptic number.

40065640 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 40065640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47232000).

40065640 is an abundant number, since it is smaller than the sum of its proper divisors (54398360).

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

40065640 is a wasteful number, since it uses less digits than its factorization.

40065640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530 (or 526 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 40065640 is about 6329.7424908127. The cubic root of 40065640 is about 342.1821584691.

The spelling of 40065640 in words is "forty million, sixty-five thousand, six hundred forty".