384531 has 8 divisors (see below), whose sum is σ = 585984. Its totient is φ = 219720.

The previous prime is 384509. The next prime is 384533. The reversal of 384531 is 135483.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 384531 - 2⁷ = 384403 is a prime.

It is a super-2 number, since 2×384531² = 295728179922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

384531 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (384533) 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 7 ways as a sum of consecutive naturals, for example, 9135 + ... + 9176.

It is an arithmetic number, because the mean of its divisors is an integer number (73248).

2³⁸⁴⁵³¹ is an apocalyptic number.

384531 is a deficient number, since it is larger than the sum of its proper divisors (201453).

384531 is a wasteful number, since it uses less digits than its factorization.

384531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18321.

The product of its digits is 1440, while the sum is 24.

The square root of 384531 is about 620.1056361621. The cubic root of 384531 is about 72.7183114432.

The spelling of 384531 in words is "three hundred eighty-four thousand, five hundred thirty-one".