306890 has 8 divisors (see below), whose sum is σ = 552420. Its totient is φ = 122752.

The previous prime is 306883. The next prime is 306893. The reversal of 306890 is 98603.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 284089 + 22801 = 533^2 + 151^2 .

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

It is not an unprimeable number, because it can be changed into a prime (306893) by changing a digit.

306890 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15335 + ... + 15354.

2³⁰⁶⁸⁹⁰ is an apocalyptic number.

306890 is a deficient number, since it is larger than the sum of its proper divisors (245530).

306890 is a wasteful number, since it uses less digits than its factorization.

306890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30696.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 306890 is about 553.9765337990. The cubic root of 306890 is about 67.4519090467.

Adding to 306890 its sum of digits (26), we get a square (306916 = 554²).

The spelling of 306890 in words is "three hundred six thousand, eight hundred ninety".