623906 has 16 divisors (see below), whose sum is σ = 1002240. Its totient is φ = 290640.

The previous prime is 623893. The next prime is 623923. The reversal of 623906 is 609326.

It is a nialpdrome in base 16.

It is an unprimeable number.

623906 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1625 + ... + 1971.

It is an arithmetic number, because the mean of its divisors is an integer number (62640).

2⁶²³⁹⁰⁶ is an apocalyptic number.

623906 is a deficient number, since it is larger than the sum of its proper divisors (378334).

623906 is a wasteful number, since it uses less digits than its factorization.

623906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 623906 is about 789.8772056465. The cubic root of 623906 is about 85.4488825006.

The spelling of 623906 in words is "six hundred twenty-three thousand, nine hundred six".