40823640 has 288 divisors, whose sum is σ = 159297840. Its totient is φ = 8985600.

The previous prime is 40823639. The next prime is 40823663. The reversal of 40823640 is 4632804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 669210 + ... + 669270.

Almost surely, 2^40823640 is an apocalyptic number.

40823640 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 40823640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79648920).

40823640 is an abundant number, since it is smaller than the sum of its proper divisors (118474200).

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

40823640 is a wasteful number, since it uses less digits than its factorization.

40823640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 40823640 is about 6389.3379938770. The cubic root of 40823640 is about 344.3266007632.

The spelling of 40823640 in words is "forty million, eight hundred twenty-three thousand, six hundred forty".