40240261 has 2 divisors, whose sum is σ = 40240262. Its totient is φ = 40240260.

The previous prime is 40240259. The next prime is 40240339. The reversal of 40240261 is 16204204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20304036 + 19936225 = 4506^2 + 4465^2 .

It is a cyclic number.

It is not a de Polignac number, because 40240261 - 2¹ = 40240259 is a prime.

Together with 40240259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40240861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20120130 + 20120131.

It is an arithmetic number, because the mean of its divisors is an integer number (20120131).

Almost surely, 2^40240261 is an apocalyptic number.

It is an amenable number.

40240261 is a deficient number, since it is larger than the sum of its proper divisors (1).

40240261 is an equidigital number, since it uses as much as digits as its factorization.

40240261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 40240261 is about 6343.5211830654. The cubic root of 40240261 is about 342.6785571524.

Adding to 40240261 its reverse (16204204), we get a palindrome (56444465).

The spelling of 40240261 in words is "forty million, two hundred forty thousand, two hundred sixty-one".