393944447 has 8 divisors (see below), whose sum is σ = 424402944. Its totient is φ = 363508128.

The previous prime is 393944443. The next prime is 393944501. The reversal of 393944447 is 744449393.

It is a happy number.

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 393944447 - 2² = 393944443 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 (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, 61058 + ... + 67200.

It is an arithmetic number, because the mean of its divisors is an integer number (53050368).

Almost surely, 2^393944447 is an apocalyptic number.

393944447 is a deficient number, since it is larger than the sum of its proper divisors (30458497).

393944447 is a wasteful number, since it uses less digits than its factorization.

393944447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11089.

The product of its digits is 1306368, while the sum is 47.

The square root of 393944447 is about 19848.0338320953. The cubic root of 393944447 is about 733.0692361457.

The spelling of 393944447 in words is "three hundred ninety-three million, nine hundred forty-four thousand, four hundred forty-seven".