397905 has 16 divisors (see below), whose sum is σ = 653184. Its totient is φ = 206720.

The previous prime is 397897. The next prime is 397907. The reversal of 397905 is 509793.

It is not a de Polignac number, because 397905 - 2³ = 397897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (397907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 292 + ... + 938.

It is an arithmetic number, because the mean of its divisors is an integer number (40824).

2³⁹⁷⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

397905 is a deficient number, since it is larger than the sum of its proper divisors (255279).

397905 is a wasteful number, since it uses less digits than its factorization.

397905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696.

The product of its (nonzero) digits is 8505, while the sum is 33.

The square root of 397905 is about 630.7971147683. The cubic root of 397905 is about 73.5517706435.

The spelling of 397905 in words is "three hundred ninety-seven thousand, nine hundred five".