31252440 has 64 divisors (see below), whose sum is σ = 94491360. Its totient is φ = 8268800.

The previous prime is 31252421. The next prime is 31252447. The reversal of 31252440 is 4425213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31252447) 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 15 ways as a sum of consecutive naturals, for example, 15490 + ... + 17390.

Almost surely, 2^31252440 is an apocalyptic number.

31252440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31252440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47245680).

31252440 is an abundant number, since it is smaller than the sum of its proper divisors (63238920).

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

31252440 is a wasteful number, since it uses less digits than its factorization.

31252440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2052 (or 2048 counting only the distinct ones).

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

The square root of 31252440 is about 5590.3881797242. The cubic root of 31252440 is about 314.9884601467.

Adding to 31252440 its reverse (4425213), we get a palindrome (35677653).

It can be divided in two parts, 3125 and 2440, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 31252440 in words is "thirty-one million, two hundred fifty-two thousand, four hundred forty".