394639 has 4 divisors (see below), whose sum is σ = 451024. Its totient is φ = 338256.

The previous prime is 394637. The next prime is 394643. The reversal of 394639 is 936493.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 394639 - 2¹ = 394637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28182 + ... + 28195.

It is an arithmetic number, because the mean of its divisors is an integer number (112756).

2³⁹⁴⁶³⁹ is an apocalyptic number.

394639 is a deficient number, since it is larger than the sum of its proper divisors (56385).

394639 is an equidigital number, since it uses as much as digits as its factorization.

394639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56384.

The product of its digits is 17496, while the sum is 34.

The square root of 394639 is about 628.2029926704. The cubic root of 394639 is about 73.3499801511.

The spelling of 394639 in words is "three hundred ninety-four thousand, six hundred thirty-nine".