31440252 has 12 divisors (see below), whose sum is σ = 73360616. Its totient is φ = 10480080.

The previous prime is 31440251. The next prime is 31440257. The reversal of 31440252 is 25204413.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31440251) 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, 1309999 + ... + 1310022.

Almost surely, 2^31440252 is an apocalyptic number.

It is an amenable number.

31440252 is an abundant number, since it is smaller than the sum of its proper divisors (41920364).

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

31440252 is a wasteful number, since it uses less digits than its factorization.

31440252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2620028 (or 2620026 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 31440252 is about 5607.1607788613. The cubic root of 31440252 is about 315.6181763319.

Adding to 31440252 its reverse (25204413), we get a palindrome (56644665).

The spelling of 31440252 in words is "thirty-one million, four hundred forty thousand, two hundred fifty-two".