390113209 has 2 divisors, whose sum is σ = 390113210. Its totient is φ = 390113208.

The previous prime is 390113123. The next prime is 390113233. The reversal of 390113209 is 902311093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 331130809 + 58982400 = 18197^2 + 7680^2 .

It is an emirp because it is prime and its reverse (902311093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 390113209 - 2²³ = 381724601 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (390113299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195056604 + 195056605.

It is an arithmetic number, because the mean of its divisors is an integer number (195056605).

Almost surely, 2^390113209 is an apocalyptic number.

It is an amenable number.

390113209 is a deficient number, since it is larger than the sum of its proper divisors (1).

390113209 is an equidigital number, since it uses as much as digits as its factorization.

390113209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 390113209 is about 19751.2837304313. The cubic root of 390113209 is about 730.6850446874.

The spelling of 390113209 in words is "three hundred ninety million, one hundred thirteen thousand, two hundred nine".