31440244 has 12 divisors (see below), whose sum is σ = 60022368. Its totient is φ = 14291000.

The previous prime is 31440223. The next prime is 31440251. The reversal of 31440244 is 44204413.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 357232 + ... + 357319.

It is an arithmetic number, because the mean of its divisors is an integer number (5001864).

Almost surely, 2^31440244 is an apocalyptic number.

It is an amenable number.

31440244 is a deficient number, since it is larger than the sum of its proper divisors (28582124).

31440244 is a wasteful number, since it uses less digits than its factorization.

31440244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714566 (or 714564 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 31440244 is about 5607.1600654877. The cubic root of 31440244 is about 315.6181495621.

Adding to 31440244 its reverse (44204413), we get a palindrome (75644657).

It can be divided in two parts, 31440 and 244, that added together give a square (31684 = 178²).

The spelling of 31440244 in words is "thirty-one million, four hundred forty thousand, two hundred forty-four".