393244009 has 4 divisors (see below), whose sum is σ = 397062016. Its totient is φ = 389426004.

The previous prime is 393243953. The next prime is 393244037. The reversal of 393244009 is 900442393.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 393244009 - 2²¹ = 391146857 is a prime.

It is a super-2 number, since 2×393244009² = 309281701228784162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (393244069) 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, 1908849 + ... + 1909054.

It is an arithmetic number, because the mean of its divisors is an integer number (99265504).

Almost surely, 2^393244009 is an apocalyptic number.

It is an amenable number.

393244009 is a deficient number, since it is larger than the sum of its proper divisors (3818007).

393244009 is a wasteful number, since it uses less digits than its factorization.

393244009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3818006.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 393244009 is about 19830.3809595277. The cubic root of 393244009 is about 732.6345097328.

The spelling of 393244009 in words is "three hundred ninety-three million, two hundred forty-four thousand, nine".