316405 has 4 divisors (see below), whose sum is σ = 379692. Its totient is φ = 253120.

The previous prime is 316403. The next prime is 316423. The reversal of 316405 is 504613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504613 = 53 ⋅9521.

It can be written as a sum of positive squares in 2 ways, for example, as 77284 + 239121 = 278^2 + 489^2 .

It is not a de Polignac number, because 316405 - 2¹ = 316403 is a prime.

It is a super-2 number, since 2×316405² = 200224248050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (316403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31636 + ... + 31645.

It is an arithmetic number, because the mean of its divisors is an integer number (94923).

2³¹⁶⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

316405 is a deficient number, since it is larger than the sum of its proper divisors (63287).

316405 is an equidigital number, since it uses as much as digits as its factorization.

316405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63286.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 316405 is about 562.4988888878. The cubic root of 316405 is about 68.1419324967.

The spelling of 316405 in words is "three hundred sixteen thousand, four hundred five".