394645 has 4 divisors (see below), whose sum is σ = 473580. Its totient is φ = 315712.

The previous prime is 394643. The next prime is 394673. The reversal of 394645 is 546493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546493 = 137 ⋅3989.

It can be written as a sum of positive squares in 2 ways, for example, as 288369 + 106276 = 537^2 + 326^2 .

It is a cyclic number.

It is not a de Polignac number, because 394645 - 2¹ = 394643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394643) 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, 39460 + ... + 39469.

It is an arithmetic number, because the mean of its divisors is an integer number (118395).

2³⁹⁴⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

394645 is a deficient number, since it is larger than the sum of its proper divisors (78935).

394645 is an equidigital number, since it uses as much as digits as its factorization.

394645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78934.

The product of its digits is 12960, while the sum is 31.

The square root of 394645 is about 628.2077681786. The cubic root of 394645 is about 73.3503518812.

The spelling of 394645 in words is "three hundred ninety-four thousand, six hundred forty-five".