1640701 has 2 divisors, whose sum is σ = 1640702. Its totient is φ = 1640700.

The previous prime is 1640689. The next prime is 1640729. The reversal of 1640701 is 1070461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 857476 + 783225 = 926^2 + 885^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640701 - 2⁹ = 1640189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820350 + 820351.

It is an arithmetic number, because the mean of its divisors is an integer number (820351).

2^1640701 is an apocalyptic number.

It is an amenable number.

1640701 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640701 is an equidigital number, since it uses as much as digits as its factorization.

1640701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 1640701 is about 1280.8985127636. The cubic root of 1640701 is about 117.9441706594.

The spelling of 1640701 in words is "one million, six hundred forty thousand, seven hundred one".