306490 has 8 divisors (see below), whose sum is σ = 551700. Its totient is φ = 122592.

The previous prime is 306479. The next prime is 306491. The reversal of 306490 is 94603.

It can be written as a sum of positive squares in 2 ways, for example, as 261121 + 45369 = 511^2 + 213^2 .

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

It is a super-2 number, since 2×306490² = 187872240200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15315 + ... + 15334.

2³⁰⁶⁴⁹⁰ is an apocalyptic number.

306490 is a deficient number, since it is larger than the sum of its proper divisors (245210).

306490 is a wasteful number, since it uses less digits than its factorization.

306490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30656.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 306490 is about 553.6153899595. The cubic root of 306490 is about 67.4225907303.

The spelling of 306490 in words is "three hundred six thousand, four hundred ninety".