306861 has 8 divisors (see below), whose sum is σ = 411840. Its totient is φ = 203232.

The previous prime is 306857. The next prime is 306871. The reversal of 306861 is 168603.

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

It is not a de Polignac number, because 306861 - 2² = 306857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306821) 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, 480 + ... + 918.

It is an arithmetic number, because the mean of its divisors is an integer number (51480).

2³⁰⁶⁸⁶¹ is an apocalyptic number.

It is an amenable number.

306861 is a deficient number, since it is larger than the sum of its proper divisors (104979).

306861 is a wasteful number, since it uses less digits than its factorization.

306861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 306861 is about 553.9503587868. The cubic root of 306861 is about 67.4497843255.

The spelling of 306861 in words is "three hundred six thousand, eight hundred sixty-one".