643703 has 2 divisors, whose sum is σ = 643704. Its totient is φ = 643702.

The previous prime is 643697. The next prime is 643723. The reversal of 643703 is 307346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643703 - 2⁶ = 643639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321851 + 321852.

It is an arithmetic number, because the mean of its divisors is an integer number (321852).

2⁶⁴³⁷⁰³ is an apocalyptic number.

643703 is a deficient number, since it is larger than the sum of its proper divisors (1).

643703 is an equidigital number, since it uses as much as digits as its factorization.

643703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 23.

The square root of 643703 is about 802.3110369427. The cubic root of 643703 is about 86.3432737354.

The spelling of 643703 in words is "six hundred forty-three thousand, seven hundred three".