306520 has 32 divisors (see below), whose sum is σ = 705600. Its totient is φ = 119808.

The previous prime is 306517. The next prime is 306529. The reversal of 306520 is 25603.

It is a junction number, because it is equal to n+sod(n) for n = 306494 and 306503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306529) 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, 3112 + ... + 3208.

It is an arithmetic number, because the mean of its divisors is an integer number (22050).

2³⁰⁶⁵²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 306520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (352800).

306520 is an abundant number, since it is smaller than the sum of its proper divisors (399080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

306520 is a wasteful number, since it uses less digits than its factorization.

306520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187 (or 183 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 306520 is about 553.6424839190. The cubic root of 306520 is about 67.4247904885.

The spelling of 306520 in words is "three hundred six thousand, five hundred twenty".