394386421 has 32 divisors (see below), whose sum is σ = 479074176. Its totient is φ = 319872000.

The previous prime is 394386413. The next prime is 394386431. The reversal of 394386421 is 124683493.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 394386421 - 2³ = 394386413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394386431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 802986 + ... + 803476.

It is an arithmetic number, because the mean of its divisors is an integer number (14971068).

Almost surely, 2^394386421 is an apocalyptic number.

It is an amenable number.

394386421 is a deficient number, since it is larger than the sum of its proper divisors (84687755).

394386421 is a wasteful number, since it uses less digits than its factorization.

394386421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693.

The product of its digits is 124416, while the sum is 40.

The square root of 394386421 is about 19859.1646601764. The cubic root of 394386421 is about 733.3432819357.

The spelling of 394386421 in words is "three hundred ninety-four million, three hundred eighty-six thousand, four hundred twenty-one".