390279689 has 2 divisors, whose sum is σ = 390279690. Its totient is φ = 390279688.

The previous prime is 390279667. The next prime is 390279713. The reversal of 390279689 is 986972093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 313892089 + 76387600 = 17717^2 + 8740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390279689 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 390279689.

It is not a weakly prime, because it can be changed into another prime (390279629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195139844 + 195139845.

It is an arithmetic number, because the mean of its divisors is an integer number (195139845).

Almost surely, 2^390279689 is an apocalyptic number.

It is an amenable number.

390279689 is a deficient number, since it is larger than the sum of its proper divisors (1).

390279689 is an equidigital number, since it uses as much as digits as its factorization.

390279689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 53.

The square root of 390279689 is about 19755.4976905164. The cubic root of 390279689 is about 730.7889693462.

The spelling of 390279689 in words is "three hundred ninety million, two hundred seventy-nine thousand, six hundred eighty-nine".