394945 has 4 divisors (see below), whose sum is σ = 473940. Its totient is φ = 315952.

The previous prime is 394943. The next prime is 394963. The reversal of 394945 is 549493.

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

It can be written as a sum of positive squares in 2 ways, for example, as 242064 + 152881 = 492^2 + 391^2 .

It is a cyclic number.

It is not a de Polignac number, because 394945 - 2¹ = 394943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 394945.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39490 + ... + 39499.

It is an arithmetic number, because the mean of its divisors is an integer number (118485).

2³⁹⁴⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

394945 is a deficient number, since it is larger than the sum of its proper divisors (78995).

394945 is an equidigital number, since it uses as much as digits as its factorization.

394945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78994.

The product of its digits is 19440, while the sum is 34.

The square root of 394945 is about 628.4464973250. The cubic root of 394945 is about 73.3689335871.

The spelling of 394945 in words is "three hundred ninety-four thousand, nine hundred forty-five".