31431344 has 60 divisors (see below), whose sum is σ = 72432864. Its totient is φ = 13168512.

The previous prime is 31431343. The next prime is 31431373. The reversal of 31431344 is 44313413.

It is not an unprimeable number, because it can be changed into a prime (31431343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36422 + ... + 37274.

Almost surely, 2^31431344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31431344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36216432).

31431344 is an abundant number, since it is smaller than the sum of its proper divisors (41001520).

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

31431344 is a wasteful number, since it uses less digits than its factorization.

31431344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922 (or 909 counting only the distinct ones).

The product of its digits is 1728, while the sum is 23.

The square root of 31431344 is about 5606.3663811777. The cubic root of 31431344 is about 315.5883653719.

Adding to 31431344 its reverse (44313413), we get a palindrome (75744757).

The spelling of 31431344 in words is "thirty-one million, four hundred thirty-one thousand, three hundred forty-four".