722405 has 4 divisors (see below), whose sum is σ = 866892. Its totient is φ = 577920.

The previous prime is 722389. The next prime is 722411. The reversal of 722405 is 504227.

722405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504227 = 449 ⋅1123.

It can be written as a sum of positive squares in 2 ways, for example, as 564001 + 158404 = 751^2 + 398^2 .

It is not a de Polignac number, because 722405 - 2⁴ = 722389 is a prime.

It is a Duffinian number.

It is a Curzon 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, 72236 + ... + 72245.

It is an arithmetic number, because the mean of its divisors is an integer number (216723).

2⁷²²⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

722405 is a deficient number, since it is larger than the sum of its proper divisors (144487).

722405 is a wasteful number, since it uses less digits than its factorization.

722405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144486.

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 722405 is about 849.9441158100. The cubic root of 722405 is about 89.7277782680.

The spelling of 722405 in words is "seven hundred twenty-two thousand, four hundred five".