393944446 has 16 divisors (see below), whose sum is σ = 678766176. Its totient is φ = 167975136.

The previous prime is 393944443. The next prime is 393944501. The reversal of 393944446 is 644449393.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 393944396 and 393944405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393944443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68661 + ... + 74176.

It is an arithmetic number, because the mean of its divisors is an integer number (42422886).

Almost surely, 2^393944446 is an apocalyptic number.

393944446 is a deficient number, since it is larger than the sum of its proper divisors (284821730).

393944446 is a wasteful number, since it uses less digits than its factorization.

393944446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143043.

The product of its digits is 1119744, while the sum is 46.

The square root of 393944446 is about 19848.0338069039. The cubic root of 393944446 is about 733.0692355254.

The spelling of 393944446 in words is "three hundred ninety-three million, nine hundred forty-four thousand, four hundred forty-six".