31252340 has 96 divisors (see below), whose sum is σ = 81715200. Its totient is φ = 9797760.

The previous prime is 31252339. The next prime is 31252349. The reversal of 31252340 is 4325213.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31252349) 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 31 ways as a sum of consecutive naturals, for example, 82271 + ... + 82649.

It is an arithmetic number, because the mean of its divisors is an integer number (851200).

Almost surely, 2^31252340 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 31252340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40857600).

31252340 is an abundant number, since it is smaller than the sum of its proper divisors (50462860).

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

31252340 is a wasteful number, since it uses less digits than its factorization.

31252340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445 (or 443 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 31252340 is about 5590.3792357943. The cubic root of 31252340 is about 314.9881241848.

Adding to 31252340 its reverse (4325213), we get a palindrome (35577553).

The spelling of 31252340 in words is "thirty-one million, two hundred fifty-two thousand, three hundred forty".