640363 has 2 divisors, whose sum is σ = 640364. Its totient is φ = 640362.

The previous prime is 640333. The next prime is 640369. The reversal of 640363 is 363046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 640363 - 2⁹ = 639851 is a prime.

640363 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (640369) 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, 320181 + 320182.

It is an arithmetic number, because the mean of its divisors is an integer number (320182).

2⁶⁴⁰³⁶³ is an apocalyptic number.

640363 is a deficient number, since it is larger than the sum of its proper divisors (1).

640363 is an equidigital number, since it uses as much as digits as its factorization.

640363 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 22.

The square root of 640363 is about 800.2268428390. The cubic root of 640363 is about 86.1936774342.

The spelling of 640363 in words is "six hundred forty thousand, three hundred sixty-three".