31440230433 has 40 divisors (see below), whose sum is σ = 48652730280. Its totient is φ = 20209512960.

The previous prime is 31440230417. The next prime is 31440230447. The reversal of 31440230433 is 33403204413.

31440230433 is a `hidden beast` number, since 314 + 40 + 2 + 304 + 3 + 3 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3621993489 + 27818236944 = 60183^2 + 166788^2 .

It is not a de Polignac number, because 31440230433 - 2⁴ = 31440230417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 31440230397 and 31440230406.

It is not an unprimeable number, because it can be changed into a prime (31440230453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1769353 + ... + 1787033.

It is an arithmetic number, because the mean of its divisors is an integer number (1216318257).

Almost surely, 2^31440230433 is an apocalyptic number.

It is an amenable number.

31440230433 is a deficient number, since it is larger than the sum of its proper divisors (17212499847).

31440230433 is a wasteful number, since it uses less digits than its factorization.

31440230433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18479 (or 18470 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 27.

Adding to 31440230433 its reverse (33403204413), we get a palindrome (64843434846).

The spelling of 31440230433 in words is "thirty-one billion, four hundred forty million, two hundred thirty thousand, four hundred thirty-three".