1640633 has 2 divisors, whose sum is σ = 1640634. Its totient is φ = 1640632.

The previous prime is 1640623. The next prime is 1640641. The reversal of 1640633 is 3360461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1605289 + 35344 = 1267^2 + 188^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640633 - 2¹⁰ = 1639609 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1640599 and 1640608.

It is not a weakly prime, because it can be changed into another prime (1640623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820316 + 820317.

It is an arithmetic number, because the mean of its divisors is an integer number (820317).

2^1640633 is an apocalyptic number.

It is an amenable number.

1640633 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640633 is an equidigital number, since it uses as much as digits as its factorization.

1640633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 1640633 is about 1280.8719686214. The cubic root of 1640633 is about 117.9425412107.

The spelling of 1640633 in words is "one million, six hundred forty thousand, six hundred thirty-three".