390889 has 2 divisors, whose sum is σ = 390890. Its totient is φ = 390888.

The previous prime is 390883. The next prime is 390893. The reversal of 390889 is 988093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 354025 + 36864 = 595^2 + 192^2 .

It is an emirp because it is prime and its reverse (988093) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390889 is a prime.

It is not a weakly prime, because it can be changed into another prime (390883) 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, 195444 + 195445.

It is an arithmetic number, because the mean of its divisors is an integer number (195445).

2³⁹⁰⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

390889 is a deficient number, since it is larger than the sum of its proper divisors (1).

390889 is an equidigital number, since it uses as much as digits as its factorization.

390889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 390889 is about 625.2111643277. The cubic root of 390889 is about 73.1169078147.

The spelling of 390889 in words is "three hundred ninety thousand, eight hundred eighty-nine".