390946889 has 2 divisors, whose sum is σ = 390946890. Its totient is φ = 390946888.

The previous prime is 390946877. The next prime is 390946937. The reversal of 390946889 is 988649093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 346257664 + 44689225 = 18608^2 + 6685^2 .

It is a cyclic number.

It is not a de Polignac number, because 390946889 - 2⁴ = 390946873 is a prime.

It is not a weakly prime, because it can be changed into another prime (390946819) 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, 195473444 + 195473445.

It is an arithmetic number, because the mean of its divisors is an integer number (195473445).

Almost surely, 2^390946889 is an apocalyptic number.

It is an amenable number.

390946889 is a deficient number, since it is larger than the sum of its proper divisors (1).

390946889 is an equidigital number, since it uses as much as digits as its factorization.

390946889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3359232, while the sum is 56.

The square root of 390946889 is about 19772.3769183171. The cubic root of 390946889 is about 731.2051707098.

The spelling of 390946889 in words is "three hundred ninety million, nine hundred forty-six thousand, eight hundred eighty-nine".