390682289 has 4 divisors (see below), whose sum is σ = 391039524. Its totient is φ = 390325056.

The previous prime is 390682277. The next prime is 390682309. The reversal of 390682289 is 982286093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 982286093 = 23 ⋅42708091.

It can be written as a sum of positive squares in 2 ways, for example, as 241647025 + 149035264 = 15545^2 + 12208^2 .

It is a cyclic number.

It is not a de Polignac number, because 390682289 - 2²⁸ = 122246833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390688289) 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, 176972 + ... + 179165.

It is an arithmetic number, because the mean of its divisors is an integer number (97759881).

Almost surely, 2^390682289 is an apocalyptic number.

It is an amenable number.

390682289 is a deficient number, since it is larger than the sum of its proper divisors (357235).

390682289 is a wasteful number, since it uses less digits than its factorization.

390682289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357234.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 390682289 is about 19765.6846327164. The cubic root of 390682289 is about 731.0401691375.

The spelling of 390682289 in words is "three hundred ninety million, six hundred eighty-two thousand, two hundred eighty-nine".