621308 has 6 divisors (see below), whose sum is σ = 1087296. Its totient is φ = 310652.

The previous prime is 621301. The next prime is 621317. The reversal of 621308 is 803126.

It is a self number, because there is not a number n which added to its sum of digits gives 621308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621301) by changing a digit.

621308 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 (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77660 + ... + 77667.

It is an arithmetic number, because the mean of its divisors is an integer number (181216).

2⁶²¹³⁰⁸ is an apocalyptic number.

It is an amenable number.

621308 is a deficient number, since it is larger than the sum of its proper divisors (465988).

621308 is a wasteful number, since it uses less digits than its factorization.

621308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155331 (or 155329 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 621308 is about 788.2309306288. The cubic root of 621308 is about 85.3301119118.

It can be divided in two parts, 621 and 308, that added together give a palindrome (929).

The spelling of 621308 in words is "six hundred twenty-one thousand, three hundred eight".