40390312 has 16 divisors (see below), whose sum is σ = 75849300. Its totient is φ = 20163840.

The previous prime is 40390309. The next prime is 40390321. The reversal of 40390312 is 21309304.

It can be written as a sum of positive squares in 2 ways, for example, as 30316036 + 10074276 = 5506^2 + 3174^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2112 + ... + 9232.

Almost surely, 2^40390312 is an apocalyptic number.

It is an amenable number.

40390312 is a deficient number, since it is larger than the sum of its proper divisors (35458988).

40390312 is a wasteful number, since it uses less digits than its factorization.

40390312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7836 (or 7832 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 40390312 is about 6355.3372845192. The cubic root of 40390312 is about 343.1039642690.

Adding to 40390312 its reverse (21309304), we get a palindrome (61699616).

The spelling of 40390312 in words is "forty million, three hundred ninety thousand, three hundred twelve".