716405 has 4 divisors (see below), whose sum is σ = 859692. Its totient is φ = 573120.

The previous prime is 716399. The next prime is 716411. The reversal of 716405 is 504617.

716405 = 598² + 599².

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

It is an interprime number because it is at equal distance from previous prime (716399) and next prime (716411).

It can be written as a sum of positive squares in 2 ways, for example, as 357604 + 358801 = 598^2 + 599^2 .

It is not a de Polignac number, because 716405 - 2⁴ = 716389 is a prime.

It is a super-2 number, since 2×716405² = 1026472248050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 71636 + ... + 71645.

It is an arithmetic number, because the mean of its divisors is an integer number (214923).

2⁷¹⁶⁴⁰⁵ is an apocalyptic number.

716405 is the 599-th centered square number.

It is an amenable number.

716405 is a deficient number, since it is larger than the sum of its proper divisors (143287).

716405 is a wasteful number, since it uses less digits than its factorization.

716405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143286.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 716405 is about 846.4071124465. The cubic root of 716405 is about 89.4786732785.

The spelling of 716405 in words is "seven hundred sixteen thousand, four hundred five".