394531 has 4 divisors (see below), whose sum is σ = 405232. Its totient is φ = 383832.

The previous prime is 394529. The next prime is 394549. The reversal of 394531 is 135493.

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

It is a cyclic number.

It is not a de Polignac number, because 394531 - 2¹ = 394529 is a prime.

It is a super-2 number, since 2×394531² = 311309419922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 394496 and 394505.

It is not an unprimeable number, because it can be changed into a prime (394501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5295 + ... + 5368.

It is an arithmetic number, because the mean of its divisors is an integer number (101308).

2³⁹⁴⁵³¹ is an apocalyptic number.

394531 is a deficient number, since it is larger than the sum of its proper divisors (10701).

394531 is a wasteful number, since it uses less digits than its factorization.

394531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10700.

The product of its digits is 1620, while the sum is 25.

The square root of 394531 is about 628.1170273126. The cubic root of 394531 is about 73.3432883639.

The spelling of 394531 in words is "three hundred ninety-four thousand, five hundred thirty-one".