31312040 has 32 divisors (see below), whose sum is σ = 70622280. Its totient is φ = 12494592.

The previous prime is 31312037. The next prime is 31312049. The reversal of 31312040 is 4021313.

It can be written as a sum of positive squares in 4 ways, for example, as 16826404 + 14485636 = 4102^2 + 3806^2 .

It is not an unprimeable number, because it can be changed into a prime (31312049) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 23882 + ... + 25158.

Almost surely, 2^31312040 is an apocalyptic number.

It is an amenable number.

31312040 is an abundant number, since it is smaller than the sum of its proper divisors (39310240).

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

31312040 is a wasteful number, since it uses less digits than its factorization.

31312040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901 (or 1897 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 31312040 is about 5595.7162186801. The cubic root of 31312040 is about 315.1885660260.

Adding to 31312040 its reverse (4021313), we get a palindrome (35333353).

The spelling of 31312040 in words is "thirty-one million, three hundred twelve thousand, forty".