40309663 has 2 divisors, whose sum is σ = 40309664. Its totient is φ = 40309662.

The previous prime is 40309649. The next prime is 40309693. The reversal of 40309663 is 36690304.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40309663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40309693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20154831 + 20154832.

It is an arithmetic number, because the mean of its divisors is an integer number (20154832).

Almost surely, 2^40309663 is an apocalyptic number.

40309663 is a deficient number, since it is larger than the sum of its proper divisors (1).

40309663 is an equidigital number, since it uses as much as digits as its factorization.

40309663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 40309663 is about 6348.9891321375. The cubic root of 40309663 is about 342.8754488324.

Adding to 40309663 its reverse (36690304), we get a palindrome (76999967).

The spelling of 40309663 in words is "forty million, three hundred nine thousand, six hundred sixty-three".