643473 has 24 divisors (see below), whose sum is σ = 1010880. Its totient is φ = 393120.

The previous prime is 643469. The next prime is 643493. The reversal of 643473 is 374346.

It is not a de Polignac number, because 643473 - 2² = 643469 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9028 + ... + 9098.

It is an arithmetic number, because the mean of its divisors is an integer number (42120).

2⁶⁴³⁴⁷³ is an apocalyptic number.

It is an amenable number.

643473 is a deficient number, since it is larger than the sum of its proper divisors (367407).

643473 is a wasteful number, since it uses less digits than its factorization.

643473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 146 counting only the distinct ones).

The product of its digits is 6048, while the sum is 27.

The square root of 643473 is about 802.1676882049. The cubic root of 643473 is about 86.3329888065.

The spelling of 643473 in words is "six hundred forty-three thousand, four hundred seventy-three".