1640334407 has 2 divisors, whose sum is σ = 1640334408. Its totient is φ = 1640334406.

The previous prime is 1640334389. The next prime is 1640334439. The reversal of 1640334407 is 7044330461.

It is an a-pointer prime, because the next prime (1640334439) can be obtained adding 1640334407 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1640334407 - 2⁸ = 1640334151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640334497) 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, 820167203 + 820167204.

It is an arithmetic number, because the mean of its divisors is an integer number (820167204).

Almost surely, 2^1640334407 is an apocalyptic number.

1640334407 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640334407 is an equidigital number, since it uses as much as digits as its factorization.

1640334407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 32.

The square root of 1640334407 is about 40501.0420483227. The cubic root of 1640334407 is about 1179.3538564863.

Adding to 1640334407 its reverse (7044330461), we get a palindrome (8684664868).

The spelling of 1640334407 in words is "one billion, six hundred forty million, three hundred thirty-four thousand, four hundred seven".