394216905 has 16 divisors (see below), whose sum is σ = 645416640. Its totient is φ = 205359168.

The previous prime is 394216903. The next prime is 394216909. The reversal of 394216905 is 509612493.

It is not a de Polignac number, because 394216905 - 2¹ = 394216903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (394216903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304950 + ... + 306239.

It is an arithmetic number, because the mean of its divisors is an integer number (40338540).

Almost surely, 2^394216905 is an apocalyptic number.

It is an amenable number.

394216905 is a deficient number, since it is larger than the sum of its proper divisors (251199735).

394216905 is a wasteful number, since it uses less digits than its factorization.

394216905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611240.

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 394216905 is about 19854.8962475254. The cubic root of 394216905 is about 733.2381978285.

The spelling of 394216905 in words is "three hundred ninety-four million, two hundred sixteen thousand, nine hundred five".