1640503 has 2 divisors, whose sum is σ = 1640504. Its totient is φ = 1640502.

The previous prime is 1640497. The next prime is 1640519. The reversal of 1640503 is 3050461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1640503 - 2⁹ = 1639991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820251 + 820252.

It is an arithmetic number, because the mean of its divisors is an integer number (820252).

2^1640503 is an apocalyptic number.

1640503 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640503 is an equidigital number, since it uses as much as digits as its factorization.

1640503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 1640503 is about 1280.8212209360. The cubic root of 1640503 is about 117.9394259629.

Adding to 1640503 its reverse (3050461), we get a palindrome (4690964).

The spelling of 1640503 in words is "one million, six hundred forty thousand, five hundred three".