1640004073 has 2 divisors, whose sum is σ = 1640004074. Its totient is φ = 1640004072.

The previous prime is 1640004043. The next prime is 1640004083. The reversal of 1640004073 is 3704000461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1444228009 + 195776064 = 38003^2 + 13992^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640004073 is a prime.

It is a super-2 number, since 2×1640004073² = 5379226718913178658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1640004013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820002036 + 820002037.

It is an arithmetic number, because the mean of its divisors is an integer number (820002037).

Almost surely, 2^1640004073 is an apocalyptic number.

It is an amenable number.

1640004073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640004073 is an equidigital number, since it uses as much as digits as its factorization.

1640004073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 1640004073 is about 40496.9637503850. The cubic root of 1640004073 is about 1179.2746842497.

The spelling of 1640004073 in words is "one billion, six hundred forty million, four thousand, seventy-three".