1640071 has 2 divisors, whose sum is σ = 1640072. Its totient is φ = 1640070.

The previous prime is 1640059. The next prime is 1640077. The reversal of 1640071 is 1700461.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1640071 - 2¹¹ = 1638023 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 (1640077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820035 + 820036.

It is an arithmetic number, because the mean of its divisors is an integer number (820036).

2^1640071 is an apocalyptic number.

1640071 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640071 is an equidigital number, since it uses as much as digits as its factorization.

1640071 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 1640071 is about 1280.6525680293. The cubic root of 1640071 is about 117.9290725723.

It can be divided in two parts, 16400 and 71, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 1640071 in words is "one million, six hundred forty thousand, seventy-one".