1640677 has 2 divisors, whose sum is σ = 1640678. Its totient is φ = 1640676.

The previous prime is 1640663. The next prime is 1640689. The reversal of 1640677 is 7760461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1515361 + 125316 = 1231^2 + 354^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640677 - 2⁷ = 1640549 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820338 + 820339.

It is an arithmetic number, because the mean of its divisors is an integer number (820339).

2^1640677 is an apocalyptic number.

It is an amenable number.

1640677 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640677 is an equidigital number, since it uses as much as digits as its factorization.

1640677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 1640677 is about 1280.8891443056. The cubic root of 1640677 is about 117.9435955650.

The spelling of 1640677 in words is "one million, six hundred forty thousand, six hundred seventy-seven".