390520391 has 2 divisors, whose sum is σ = 390520392. Its totient is φ = 390520390.

The previous prime is 390520369. The next prime is 390520457. The reversal of 390520391 is 193025093.

It is a weak prime.

It is an emirp because it is prime and its reverse (193025093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 390520391 - 2⁶ = 390520327 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390526391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195260195 + 195260196.

It is an arithmetic number, because the mean of its divisors is an integer number (195260196).

Almost surely, 2^390520391 is an apocalyptic number.

390520391 is a deficient number, since it is larger than the sum of its proper divisors (1).

390520391 is an equidigital number, since it uses as much as digits as its factorization.

390520391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 390520391 is about 19761.5887772213. The cubic root of 390520391 is about 730.9391746321.

The spelling of 390520391 in words is "three hundred ninety million, five hundred twenty thousand, three hundred ninety-one".