643038 has 16 divisors (see below), whose sum is σ = 1403136. Its totient is φ = 194840.

The previous prime is 643031. The next prime is 643039. The reversal of 643038 is 830346.

It is a junction number, because it is equal to n+sod(n) for n = 642999 and 643017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4806 + ... + 4937.

It is an arithmetic number, because the mean of its divisors is an integer number (87696).

2⁶⁴³⁰³⁸ is an apocalyptic number.

643038 is an abundant number, since it is smaller than the sum of its proper divisors (760098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643038 is a wasteful number, since it uses less digits than its factorization.

643038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9759.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 643038 is about 801.8965020500. The cubic root of 643038 is about 86.3135301730.

The spelling of 643038 in words is "six hundred forty-three thousand, thirty-eight".