490309 has 2 divisors, whose sum is σ = 490310. Its totient is φ = 490308.

The previous prime is 490283. The next prime is 490313. The reversal of 490309 is 903094.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 459684 + 30625 = 678^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 490309 - 2⁵ = 490277 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a nialpdrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (490339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245154 + 245155.

It is an arithmetic number, because the mean of its divisors is an integer number (245155).

2⁴⁹⁰³⁰⁹ is an apocalyptic number.

It is an amenable number.

490309 is a deficient number, since it is larger than the sum of its proper divisors (1).

490309 is an equidigital number, since it uses as much as digits as its factorization.

490309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 490309 is about 700.2206795004. The cubic root of 490309 is about 78.8539200819.

The spelling of 490309 in words is "four hundred ninety thousand, three hundred nine".