397405 has 4 divisors (see below), whose sum is σ = 476892. Its totient is φ = 317920.

The previous prime is 397379. The next prime is 397427. The reversal of 397405 is 504793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504793 = 151 ⋅3343.

It can be written as a sum of positive squares in 2 ways, for example, as 168921 + 228484 = 411^2 + 478^2 .

It is not a de Polignac number, because 397405 - 2⁵ = 397373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39736 + ... + 39745.

It is an arithmetic number, because the mean of its divisors is an integer number (119223).

2³⁹⁷⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

397405 is a deficient number, since it is larger than the sum of its proper divisors (79487).

397405 is an equidigital number, since it uses as much as digits as its factorization.

397405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79486.

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

The square root of 397405 is about 630.4006662433. The cubic root of 397405 is about 73.5209498027.

The spelling of 397405 in words is "three hundred ninety-seven thousand, four hundred five".