390581 has 2 divisors, whose sum is σ = 390582. Its totient is φ = 390580.

The previous prime is 390553. The next prime is 390647. The reversal of 390581 is 185093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 320356 + 70225 = 566^2 + 265^2 .

It is a cyclic number.

It is not a de Polignac number, because 390581 - 2¹⁸ = 128437 is a prime.

It is a super-2 number, since 2×390581² = 305107035122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a nialpdrome in base 5.

It is a self number, because there is not a number n which added to its sum of digits gives 390581.

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 390581.

It is not a weakly prime, because it can be changed into another prime (390281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195290 + 195291.

It is an arithmetic number, because the mean of its divisors is an integer number (195291).

2³⁹⁰⁵⁸¹ is an apocalyptic number.

It is an amenable number.

390581 is a deficient number, since it is larger than the sum of its proper divisors (1).

390581 is an equidigital number, since it uses as much as digits as its factorization.

390581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 390581 is about 624.9647990087. The cubic root of 390581 is about 73.0976986743.

The spelling of 390581 in words is "three hundred ninety thousand, five hundred eighty-one".