393421406 has 8 divisors (see below), whose sum is σ = 674436720. Its totient is φ = 168609168.

The previous prime is 393421397. The next prime is 393421423. The reversal of 393421406 is 604124393.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14050751 + ... + 14050778.

It is an arithmetic number, because the mean of its divisors is an integer number (84304590).

Almost surely, 2^393421406 is an apocalyptic number.

393421406 is a deficient number, since it is larger than the sum of its proper divisors (281015314).

393421406 is a wasteful number, since it uses less digits than its factorization.

393421406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28101538.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 393421406 is about 19834.8533143051. The cubic root of 393421406 is about 732.7446598540.

Adding to 393421406 its reverse (604124393), we get a palindrome (997545799).

The spelling of 393421406 in words is "three hundred ninety-three million, four hundred twenty-one thousand, four hundred six".