1640888339 has 2 divisors, whose sum is σ = 1640888340. Its totient is φ = 1640888338.

The previous prime is 1640888329. The next prime is 1640888363. The reversal of 1640888339 is 9338880461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1640888339 - 2⁴ = 1640888323 is a prime.

It is not a weakly prime, because it can be changed into another prime (1640888309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820444169 + 820444170.

It is an arithmetic number, because the mean of its divisors is an integer number (820444170).

Almost surely, 2^1640888339 is an apocalyptic number.

1640888339 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640888339 is an equidigital number, since it uses as much as digits as its factorization.

1640888339 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 50.

The square root of 1640888339 is about 40507.8799618050. The cubic root of 1640888339 is about 1179.4865953382.

The spelling of 1640888339 in words is "one billion, six hundred forty million, eight hundred eighty-eight thousand, three hundred thirty-nine".