31405687444 has 12 divisors (see below), whose sum is σ = 54962812800. Its totient is φ = 15702026648.

The previous prime is 31405687403. The next prime is 31405687447. The reversal of 31405687444 is 44478650413.

It is a junction number, because it is equal to n+sod(n) for n = 31405687394 and 31405687403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31405687447) 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 3 ways as a sum of consecutive naturals, for example, 113284 + ... + 275035.

It is an arithmetic number, because the mean of its divisors is an integer number (4580234400).

Almost surely, 2^31405687444 is an apocalyptic number.

It is an amenable number.

31405687444 is a deficient number, since it is larger than the sum of its proper divisors (23557125356).

31405687444 is a wasteful number, since it uses less digits than its factorization.

31405687444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408542 (or 408540 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 46.

The spelling of 31405687444 in words is "thirty-one billion, four hundred five million, six hundred eighty-seven thousand, four hundred forty-four".