31440422 has 24 divisors (see below), whose sum is σ = 51465456. Its totient is φ = 14398176.

The previous prime is 31440419. The next prime is 31440427. The reversal of 31440422 is 22404413.

It is a junction number, because it is equal to n+sod(n) for n = 31440394 and 31440403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31440427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56168 + ... + 56724.

It is an arithmetic number, because the mean of its divisors is an integer number (2144394).

Almost surely, 2^31440422 is an apocalyptic number.

31440422 is a deficient number, since it is larger than the sum of its proper divisors (20025034).

31440422 is a wasteful number, since it uses less digits than its factorization.

31440422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752 (or 739 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 31440422 is about 5607.1759380280. The cubic root of 31440422 is about 315.6187451886.

Adding to 31440422 its reverse (22404413), we get a palindrome (53844835).

The spelling of 31440422 in words is "thirty-one million, four hundred forty thousand, four hundred twenty-two".