40640243252 has 12 divisors (see below), whose sum is σ = 81280486560. Its totient is φ = 17417247096.

The previous prime is 40640243251. The next prime is 40640243257. The reversal of 40640243252 is 25234204604.

It is a happy number.

40640243252 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

40640243252 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40640243251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 725718602 + ... + 725718657.

It is an arithmetic number, because the mean of its divisors is an integer number (6773373880).

Almost surely, 2^40640243252 is an apocalyptic number.

It is an amenable number.

40640243252 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

40640243252 is a wasteful number, since it uses less digits than its factorization.

40640243252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451437270 (or 1451437268 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 32.

Adding to 40640243252 its reverse (25234204604), we get a palindrome (65874447856).

The spelling of 40640243252 in words is "forty billion, six hundred forty million, two hundred forty-three thousand, two hundred fifty-two".