40235381 has 2 divisors, whose sum is σ = 40235382. Its totient is φ = 40235380.

The previous prime is 40235359. The next prime is 40235399. The reversal of 40235381 is 18353204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33814225 + 6421156 = 5815^2 + 2534^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40235381 is a prime.

It is a super-4 number, since 4×40235381⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40235381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40235341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20117690 + 20117691.

It is an arithmetic number, because the mean of its divisors is an integer number (20117691).

Almost surely, 2^40235381 is an apocalyptic number.

It is an amenable number.

40235381 is a deficient number, since it is larger than the sum of its proper divisors (1).

40235381 is an equidigital number, since it uses as much as digits as its factorization.

40235381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 40235381 is about 6343.1365269873. The cubic root of 40235381 is about 342.6647042025.

Adding to 40235381 its reverse (18353204), we get a palindrome (58588585).

The spelling of 40235381 in words is "forty million, two hundred thirty-five thousand, three hundred eighty-one".