40390841 has 2 divisors, whose sum is σ = 40390842. Its totient is φ = 40390840.

The previous prime is 40390807. The next prime is 40390843. The reversal of 40390841 is 14809304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38700841 + 1690000 = 6221^2 + 1300^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40390841 is a prime.

Together with 40390843, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40390843) by changing a digit.

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 as a sum of consecutive naturals, namely, 20195420 + 20195421.

It is an arithmetic number, because the mean of its divisors is an integer number (20195421).

Almost surely, 2^40390841 is an apocalyptic number.

It is an amenable number.

40390841 is a deficient number, since it is larger than the sum of its proper divisors (1).

40390841 is an equidigital number, since it uses as much as digits as its factorization.

40390841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 40390841 is about 6355.3789029451. The cubic root of 40390841 is about 343.1054621629.

The spelling of 40390841 in words is "forty million, three hundred ninety thousand, eight hundred forty-one".