384256569 has 4 divisors (see below), whose sum is σ = 512342096. Its totient is φ = 256171044.

The previous prime is 384256549. The next prime is 384256571. The reversal of 384256569 is 965652483.

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 not a de Polignac number, because 384256569 - 2⁷ = 384256441 is a prime.

It is a super-2 number, since 2×384256569² = 295306221639303522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (384256529) 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, 64042759 + ... + 64042764.

It is an arithmetic number, because the mean of its divisors is an integer number (128085524).

Almost surely, 2^384256569 is an apocalyptic number.

It is an amenable number.

384256569 is a deficient number, since it is larger than the sum of its proper divisors (128085527).

384256569 is a wasteful number, since it uses less digits than its factorization.

384256569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128085526.

The product of its digits is 1555200, while the sum is 48.

The square root of 384256569 is about 19602.4633401009. The cubic root of 384256569 is about 727.0100819307.

The spelling of 384256569 in words is "three hundred eighty-four million, two hundred fifty-six thousand, five hundred sixty-nine".