40006783 has 2 divisors, whose sum is σ = 40006784. Its totient is φ = 40006782.

The previous prime is 40006781. The next prime is 40006793. The reversal of 40006783 is 38760004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40006783 - 2¹ = 40006781 is a prime.

Together with 40006781, 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 (40006781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20003391 + 20003392.

It is an arithmetic number, because the mean of its divisors is an integer number (20003392).

Almost surely, 2^40006783 is an apocalyptic number.

40006783 is a deficient number, since it is larger than the sum of its proper divisors (1).

40006783 is an equidigital number, since it uses as much as digits as its factorization.

40006783 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 40006783 is about 6325.0915408395. The cubic root of 40006783 is about 342.0145195208.

Adding to 40006783 its reverse (38760004), we get a palindrome (78766787).

The spelling of 40006783 in words is "forty million, six thousand, seven hundred eighty-three".