40312693 has 2 divisors, whose sum is σ = 40312694. Its totient is φ = 40312692.

The previous prime is 40312687. The next prime is 40312739. The reversal of 40312693 is 39621304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35724529 + 4588164 = 5977^2 + 2142^2 .

It is a cyclic number.

It is not a de Polignac number, because 40312693 - 2²⁵ = 6758261 is a prime.

It is a super-2 number, since 2×40312693² = 3250226433824498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40312603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20156346 + 20156347.

It is an arithmetic number, because the mean of its divisors is an integer number (20156347).

Almost surely, 2^40312693 is an apocalyptic number.

It is an amenable number.

40312693 is a deficient number, since it is larger than the sum of its proper divisors (1).

40312693 is an equidigital number, since it uses as much as digits as its factorization.

40312693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 40312693 is about 6349.2277483171. The cubic root of 40312693 is about 342.8840397137.

Adding to 40312693 its reverse (39621304), we get a palindrome (79933997).

It can be divided in two parts, 4031 and 2693, that added together give a square (6724 = 82²).

The spelling of 40312693 in words is "forty million, three hundred twelve thousand, six hundred ninety-three".