623405 has 8 divisors (see below), whose sum is σ = 766584. Its totient is φ = 486400.

The previous prime is 623401. The next prime is 623417. The reversal of 623405 is 504326.

It can be written as a sum of positive squares in 4 ways, for example, as 77284 + 546121 = 278^2 + 739^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 623405 - 2² = 623401 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 (623401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1316 + ... + 1725.

It is an arithmetic number, because the mean of its divisors is an integer number (95823).

2⁶²³⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

623405 is a deficient number, since it is larger than the sum of its proper divisors (143179).

623405 is a wasteful number, since it uses less digits than its factorization.

623405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3087.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 623405 is about 789.5600040529. The cubic root of 623405 is about 85.4260043992.

The spelling of 623405 in words is "six hundred twenty-three thousand, four hundred five".