390021778073 has 2 divisors, whose sum is σ = 390021778074. Its totient is φ = 390021778072.

The previous prime is 390021778051. The next prime is 390021778103. The reversal of 390021778073 is 370877120093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198980229184 + 191041548889 = 446072^2 + 437083^2 .

It is an emirp because it is prime and its reverse (370877120093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 390021778073 - 2¹⁰ = 390021777049 is a prime.

It is not a weakly prime, because it can be changed into another prime (390021778033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195010889036 + 195010889037.

It is an arithmetic number, because the mean of its divisors is an integer number (195010889037).

Almost surely, 2^390021778073 is an apocalyptic number.

It is an amenable number.

390021778073 is a deficient number, since it is larger than the sum of its proper divisors (1).

390021778073 is an equidigital number, since it uses as much as digits as its factorization.

390021778073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 444528, while the sum is 47.

The spelling of 390021778073 in words is "three hundred ninety billion, twenty-one million, seven hundred seventy-eight thousand, seventy-three".