306381 has 8 divisors (see below), whose sum is σ = 414400. Its totient is φ = 201312.

The previous prime is 306377. The next prime is 306389. The reversal of 306381 is 183603.

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

It is not a de Polignac number, because 306381 - 2² = 306377 is a prime.

It is a super-2 number, since 2×306381² = 187738634322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

306381 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 306381.

It is not an unprimeable number, because it can be changed into a prime (306389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481 + ... + 918.

It is an arithmetic number, because the mean of its divisors is an integer number (51800).

2³⁰⁶³⁸¹ is an apocalyptic number.

It is an amenable number.

306381 is a deficient number, since it is larger than the sum of its proper divisors (108019).

306381 is a wasteful number, since it uses less digits than its factorization.

306381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 306381 is about 553.5169374102. The cubic root of 306381 is about 67.4145970668.

Adding to 306381 its reverse (183603), we get a palindrome (489984).

The spelling of 306381 in words is "three hundred six thousand, three hundred eighty-one".