31233140 has 12 divisors (see below), whose sum is σ = 65589636. Its totient is φ = 12493248.

The previous prime is 31233121. The next prime is 31233221. The reversal of 31233140 is 4133213.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10784656 + 20448484 = 3284^2 + 4522^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 780809 + ... + 780848.

It is an arithmetic number, because the mean of its divisors is an integer number (5465803).

Almost surely, 2^31233140 is an apocalyptic number.

It is an amenable number.

31233140 is an abundant number, since it is smaller than the sum of its proper divisors (34356496).

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

31233140 is a wasteful number, since it uses less digits than its factorization.

31233140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561666 (or 1561664 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 31233140 is about 5588.6617360509. The cubic root of 31233140 is about 314.9236062330.

Adding to 31233140 its reverse (4133213), we get a palindrome (35366353).

The spelling of 31233140 in words is "thirty-one million, two hundred thirty-three thousand, one hundred forty".