40431443540 has 24 divisors (see below), whose sum is σ = 84989890440. Its totient is φ = 16156604288.

The previous prime is 40431443539. The next prime is 40431443551. The reversal of 40431443540 is 4534413404.

It can be written as a sum of positive squares in 4 ways, for example, as 6509907856 + 33921535684 = 80684^2 + 184178^2 .

It is a junction number, because it is equal to n+sod(n) for n = 40431443497 and 40431443506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 977555 + ... + 1018074.

It is an arithmetic number, because the mean of its divisors is an integer number (3541245435).

Almost surely, 2^40431443540 is an apocalyptic number.

It is an amenable number.

40431443540 is an abundant number, since it is smaller than the sum of its proper divisors (44558446900).

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

40431443540 is a wasteful number, since it uses less digits than its factorization.

40431443540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1996651 (or 1996649 counting only the distinct ones).

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

Adding to 40431443540 its reverse (4534413404), we get a palindrome (44965856944).

The spelling of 40431443540 in words is "forty billion, four hundred thirty-one million, four hundred forty-three thousand, five hundred forty".