397427505 has 16 divisors (see below), whose sum is σ = 646309824. Its totient is φ = 208486080.

The previous prime is 397427497. The next prime is 397427509. The reversal of 397427505 is 505724793.

It is not a de Polignac number, because 397427505 - 2³ = 397427497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (397427509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 216259 + ... + 218088.

It is an arithmetic number, because the mean of its divisors is an integer number (40394364).

Almost surely, 2^397427505 is an apocalyptic number.

It is an amenable number.

397427505 is a deficient number, since it is larger than the sum of its proper divisors (248882319).

397427505 is a wasteful number, since it uses less digits than its factorization.

397427505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434416.

The product of its (nonzero) digits is 264600, while the sum is 42.

The square root of 397427505 is about 19935.5838891165. The cubic root of 397427505 is about 735.2233760416.

The spelling of 397427505 in words is "three hundred ninety-seven million, four hundred twenty-seven thousand, five hundred five".