394921 has 4 divisors (see below), whose sum is σ = 400000. Its totient is φ = 389844.

The previous prime is 394897. The next prime is 394931. The reversal of 394921 is 129493.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 394921 - 2⁹ = 394409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 394921.

It is not an unprimeable number, because it can be changed into a prime (394931) 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, 2421 + ... + 2578.

It is an arithmetic number, because the mean of its divisors is an integer number (100000).

2³⁹⁴⁹²¹ is an apocalyptic number.

It is an amenable number.

394921 is a deficient number, since it is larger than the sum of its proper divisors (5079).

394921 is an equidigital number, since it uses as much as digits as its factorization.

394921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5078.

The product of its digits is 1944, while the sum is 28.

The square root of 394921 is about 628.4274023306. The cubic root of 394921 is about 73.3674473970.

It can be divided in two parts, 39492 and 1, that added together give a palindrome (39493).

The spelling of 394921 in words is "three hundred ninety-four thousand, nine hundred twenty-one".