306545 has 8 divisors (see below), whose sum is σ = 378024. Its totient is φ = 238464.

The previous prime is 306541. The next prime is 306563. The reversal of 306545 is 545603.

306545 = 391² + 392².

It can be written as a sum of positive squares in 4 ways, for example, as 59536 + 247009 = 244^2 + 497^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 306545 - 2² = 306541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 306545.

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 306545.

It is not an unprimeable number, because it can be changed into a prime (306541) 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, 644 + ... + 1013.

It is an arithmetic number, because the mean of its divisors is an integer number (47253).

2³⁰⁶⁵⁴⁵ is an apocalyptic number.

306545 is the 392-nd centered square number.

It is an amenable number.

306545 is a deficient number, since it is larger than the sum of its proper divisors (71479).

306545 is a wasteful number, since it uses less digits than its factorization.

306545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1699.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 306545 is about 553.6650612058. The cubic root of 306545 is about 67.4266235108.

The spelling of 306545 in words is "three hundred six thousand, five hundred forty-five".