505427389 has 2 divisors, whose sum is σ = 505427390. Its totient is φ = 505427388.

The previous prime is 505427383. The next prime is 505427407. The reversal of 505427389 is 983724505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 278322489 + 227104900 = 16683^2 + 15070^2 .

It is a cyclic number.

It is not a de Polignac number, because 505427389 - 2⁷ = 505427261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505427383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252713694 + 252713695.

It is an arithmetic number, because the mean of its divisors is an integer number (252713695).

Almost surely, 2^505427389 is an apocalyptic number.

It is an amenable number.

505427389 is a deficient number, since it is larger than the sum of its proper divisors (1).

505427389 is an equidigital number, since it uses as much as digits as its factorization.

505427389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 505427389 is about 22481.7123235754. The cubic root of 505427389 is about 796.5620115632.

The spelling of 505427389 in words is "five hundred five million, four hundred twenty-seven thousand, three hundred eighty-nine".