40308491 has 2 divisors, whose sum is σ = 40308492. Its totient is φ = 40308490.

The previous prime is 40308487. The next prime is 40308497. The reversal of 40308491 is 19480304.

40308491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40308491 - 2² = 40308487 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40308497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20154245 + 20154246.

It is an arithmetic number, because the mean of its divisors is an integer number (20154246).

Almost surely, 2^40308491 is an apocalyptic number.

40308491 is a deficient number, since it is larger than the sum of its proper divisors (1).

40308491 is an equidigital number, since it uses as much as digits as its factorization.

40308491 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 40308491 is about 6348.8968333089. The cubic root of 40308491 is about 342.8721257755.

Adding to 40308491 its reverse (19480304), we get a palindrome (59788795).

It can be divided in two parts, 4030 and 8491, that added together give a palindrome (12521).

The spelling of 40308491 in words is "forty million, three hundred eight thousand, four hundred ninety-one".