390281813 has 2 divisors, whose sum is σ = 390281814. Its totient is φ = 390281812.

The previous prime is 390281777. The next prime is 390281819. The reversal of 390281813 is 318182093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 326633329 + 63648484 = 18073^2 + 7978^2 .

It is a cyclic number.

It is not a de Polignac number, because 390281813 - 2⁸ = 390281557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390281819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195140906 + 195140907.

It is an arithmetic number, because the mean of its divisors is an integer number (195140907).

Almost surely, 2^390281813 is an apocalyptic number.

It is an amenable number.

390281813 is a deficient number, since it is larger than the sum of its proper divisors (1).

390281813 is an equidigital number, since it uses as much as digits as its factorization.

390281813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 390281813 is about 19755.5514476311. The cubic root of 390281813 is about 730.7902950561.

The spelling of 390281813 in words is "three hundred ninety million, two hundred eighty-one thousand, eight hundred thirteen".