40331640 has 64 divisors (see below), whose sum is σ = 123586560. Its totient is φ = 10524800.

The previous prime is 40331639. The next prime is 40331657. The reversal of 40331640 is 4613304.

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, 2065 + ... + 9215.

It is an arithmetic number, because the mean of its divisors is an integer number (1931040).

Almost surely, 2^40331640 is an apocalyptic number.

40331640 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 40331640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61793280).

40331640 is an abundant number, since it is smaller than the sum of its proper divisors (83254920).

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

40331640 is a wasteful number, since it uses less digits than its factorization.

40331640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7212 (or 7208 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 40331640 is about 6350.7196442608. The cubic root of 40331640 is about 342.9377498967.

Adding to 40331640 its reverse (4613304), we get a palindrome (44944944).

The spelling of 40331640 in words is "forty million, three hundred thirty-one thousand, six hundred forty".