40031312 has 10 divisors (see below), whose sum is σ = 77560698. Its totient is φ = 20015648.

The previous prime is 40031287. The next prime is 40031317. The reversal of 40031312 is 21313004.

It can be written as a sum of positive squares in only one way, i.e., 29637136 + 10394176 = 5444^2 + 3224^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40031317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1250963 + ... + 1250994.

Almost surely, 2^40031312 is an apocalyptic number.

It is an amenable number.

40031312 is a deficient number, since it is larger than the sum of its proper divisors (37529386).

40031312 is a wasteful number, since it uses less digits than its factorization.

40031312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2501965 (or 2501959 counting only the distinct ones).

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

The square root of 40031312 is about 6327.0302670368. The cubic root of 40031312 is about 342.0844040050.

Adding to 40031312 its reverse (21313004), we get a palindrome (61344316).

The spelling of 40031312 in words is "forty million, thirty-one thousand, three hundred twelve".