643094 has 4 divisors (see below), whose sum is σ = 964644. Its totient is φ = 321546.

The previous prime is 643087. The next prime is 643099. The reversal of 643094 is 490346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 490346 = 2 ⋅245173.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 643094.

It is not an unprimeable number, because it can be changed into a prime (643099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160772 + ... + 160775.

It is an arithmetic number, because the mean of its divisors is an integer number (241161).

2⁶⁴³⁰⁹⁴ is an apocalyptic number.

643094 is a deficient number, since it is larger than the sum of its proper divisors (321550).

643094 is a wasteful number, since it uses less digits than its factorization.

643094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321549.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 643094 is about 801.9314185141. The cubic root of 643094 is about 86.3160356845.

The spelling of 643094 in words is "six hundred forty-three thousand, ninety-four".