405397 has 4 divisors (see below), whose sum is σ = 413100. Its totient is φ = 397696.

The previous prime is 405373. The next prime is 405401. The reversal of 405397 is 793504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 133956 + 271441 = 366^2 + 521^2 .

It is a cyclic number.

It is not a de Polignac number, because 405397 - 2⁷ = 405269 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 (405347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3772 + ... + 3877.

It is an arithmetic number, because the mean of its divisors is an integer number (103275).

2⁴⁰⁵³⁹⁷ is an apocalyptic number.

It is an amenable number.

405397 is a deficient number, since it is larger than the sum of its proper divisors (7703).

405397 is an equidigital number, since it uses as much as digits as its factorization.

405397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7702.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 405397 is about 636.7079393254. The cubic root of 405397 is about 74.0105293028.

The spelling of 405397 in words is "four hundred five thousand, three hundred ninety-seven".