394512221 has 8 divisors (see below), whose sum is σ = 400943544. Its totient is φ = 388108800.

The previous prime is 394512211. The next prime is 394512233. The reversal of 394512221 is 122215493.

It can be written as a sum of positive squares in 4 ways, for example, as 228463225 + 166048996 = 15115^2 + 12886^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 394512221 - 2¹⁴ = 394495837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394512211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22535 + ... + 36011.

It is an arithmetic number, because the mean of its divisors is an integer number (50117943).

Almost surely, 2^394512221 is an apocalyptic number.

It is an amenable number.

394512221 is a deficient number, since it is larger than the sum of its proper divisors (6431323).

394512221 is a wasteful number, since it uses less digits than its factorization.

394512221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13951.

The product of its digits is 4320, while the sum is 29.

The square root of 394512221 is about 19862.3317110555. The cubic root of 394512221 is about 733.4212467377.

The spelling of 394512221 in words is "three hundred ninety-four million, five hundred twelve thousand, two hundred twenty-one".