623406 has 16 divisors (see below), whose sum is σ = 1425024. Its totient is φ = 178104.

The previous prime is 623401. The next prime is 623417. The reversal of 623406 is 604326.

623406 = T₁₀₈ + T₁₀₉ + ... + T₁₇₀.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623401) by changing a digit.

623406 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7380 + ... + 7463.

It is an arithmetic number, because the mean of its divisors is an integer number (89064).

2⁶²³⁴⁰⁶ is an apocalyptic number.

623406 is an abundant number, since it is smaller than the sum of its proper divisors (801618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

623406 is a wasteful number, since it uses less digits than its factorization.

623406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14855.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 623406 is about 789.5606373167. The cubic root of 623406 is about 85.4260500763.

The spelling of 623406 in words is "six hundred twenty-three thousand, four hundred six".