306690 has 16 divisors (see below), whose sum is σ = 736128. Its totient is φ = 81776.

The previous prime is 306689. The next prime is 306701. The reversal of 306690 is 96603.

It is a super-2 number, since 2×306690² = 188117512200, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 306690.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5082 + ... + 5141.

It is an arithmetic number, because the mean of its divisors is an integer number (46008).

2³⁰⁶⁶⁹⁰ is an apocalyptic number.

306690 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

306690 is an abundant number, since it is smaller than the sum of its proper divisors (429438).

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

306690 is a wasteful number, since it uses less digits than its factorization.

306690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10233.

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 306690 is about 553.7959913181. The cubic root of 306690 is about 67.4372530750.

The spelling of 306690 in words is "three hundred six thousand, six hundred ninety".