1640339069 has 2 divisors, whose sum is σ = 1640339070. Its totient is φ = 1640339068.

The previous prime is 1640339009. The next prime is 1640339083. The reversal of 1640339069 is 9609330461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 824551225 + 815787844 = 28715^2 + 28562^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640339069 - 2⁸ = 1640338813 is a prime.

It is a super-2 number, since 2×1640339069² = 5381424522575573522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640339009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820169534 + 820169535.

It is an arithmetic number, because the mean of its divisors is an integer number (820169535).

Almost surely, 2^1640339069 is an apocalyptic number.

It is an amenable number.

1640339069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640339069 is an equidigital number, since it uses as much as digits as its factorization.

1640339069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 1640339069 is about 40501.0996023565. The cubic root of 1640339069 is about 1179.3549737671.

The spelling of 1640339069 in words is "one billion, six hundred forty million, three hundred thirty-nine thousand, sixty-nine".