393969407 has 8 divisors (see below), whose sum is σ = 449232336. Its totient is φ = 342271872.

The previous prime is 393969403. The next prime is 393969409. The reversal of 393969407 is 704969393.

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 393969407 - 2² = 393969403 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 (393969403) 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, 891113 + ... + 891554.

It is an arithmetic number, because the mean of its divisors is an integer number (56154042).

Almost surely, 2^393969407 is an apocalyptic number.

393969407 is a deficient number, since it is larger than the sum of its proper divisors (55262929).

393969407 is a wasteful number, since it uses less digits than its factorization.

393969407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782697.

The product of its (nonzero) digits is 1102248, while the sum is 50.

The square root of 393969407 is about 19848.6625997824. The cubic root of 393969407 is about 733.0847180424.

The spelling of 393969407 in words is "three hundred ninety-three million, nine hundred sixty-nine thousand, four hundred seven".