393447 has 4 divisors (see below), whose sum is σ = 524600. Its totient is φ = 262296.

The previous prime is 393413. The next prime is 393451. The reversal of 393447 is 744393.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 393447 - 2⁶ = 393383 is a prime.

It is a D-number.

It is a Duffinian number.

393447 is a lucky number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65572 + ... + 65577.

It is an arithmetic number, because the mean of its divisors is an integer number (131150).

2³⁹³⁴⁴⁷ is an apocalyptic number.

393447 is a deficient number, since it is larger than the sum of its proper divisors (131153).

393447 is a wasteful number, since it uses less digits than its factorization.

393447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131152.

The product of its digits is 9072, while the sum is 30.

The square root of 393447 is about 627.2535372559. The cubic root of 393447 is about 73.2760549059.

It can be divided in two parts, 39 and 3447, that added together give a triangular number (3486 = T₈₃).

The spelling of 393447 in words is "three hundred ninety-three thousand, four hundred forty-seven".