621908 has 36 divisors (see below), whose sum is σ = 1340640. Its totient is φ = 250992.

The previous prime is 621893. The next prime is 621913. The reversal of 621908 is 809126.

621908 is nontrivially palindromic in base 6.

It is a congruent number.

It is an unprimeable number.

621908 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 (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3641 + ... + 3807.

It is an arithmetic number, because the mean of its divisors is an integer number (37240).

2⁶²¹⁹⁰⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (670320).

621908 is an abundant number, since it is smaller than the sum of its proper divisors (718732).

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

621908 is a wasteful number, since it uses less digits than its factorization.

621908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 621908 is about 788.6114379084. The cubic root of 621908 is about 85.3575709687.

The spelling of 621908 in words is "six hundred twenty-one thousand, nine hundred eight".