505446397 has 8 divisors (see below), whose sum is σ = 541193400. Its totient is φ = 470367744.

The previous prime is 505446391. The next prime is 505446421. The reversal of 505446397 is 793644505.

It can be written as a sum of positive squares in 4 ways, for example, as 129823236 + 375623161 = 11394^2 + 19381^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505446397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505446391) 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 in 7 ways as a sum of consecutive naturals, for example, 165522 + ... + 168547.

It is an arithmetic number, because the mean of its divisors is an integer number (67649175).

Almost surely, 2^505446397 is an apocalyptic number.

It is an amenable number.

505446397 is a deficient number, since it is larger than the sum of its proper divisors (35747003).

505446397 is a wasteful number, since it uses less digits than its factorization.

505446397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334175.

The product of its (nonzero) digits is 453600, while the sum is 43.

The square root of 505446397 is about 22482.1350632007. The cubic root of 505446397 is about 796.5719970800.

The spelling of 505446397 in words is "five hundred five million, four hundred forty-six thousand, three hundred ninety-seven".