384649 has 4 divisors (see below), whose sum is σ = 386836. Its totient is φ = 382464.

The previous prime is 384641. The next prime is 384673. The reversal of 384649 is 946483.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 946483 = 173 ⋅5471.

It can be written as a sum of positive squares in 2 ways, for example, as 186624 + 198025 = 432^2 + 445^2 .

It is a cyclic number.

It is not a de Polignac number, because 384649 - 2³ = 384641 is a prime.

It is a Duffinian number.

384649 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (384641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 804 + ... + 1189.

It is an arithmetic number, because the mean of its divisors is an integer number (96709).

2³⁸⁴⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

384649 is a deficient number, since it is larger than the sum of its proper divisors (2187).

384649 is a wasteful number, since it uses less digits than its factorization.

384649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2186.

The product of its digits is 20736, while the sum is 34.

The square root of 384649 is about 620.2007739434. The cubic root of 384649 is about 72.7257489738.

The spelling of 384649 in words is "three hundred eighty-four thousand, six hundred forty-nine".