621886 has 8 divisors (see below), whose sum is σ = 939960. Its totient is φ = 308568.

The previous prime is 621883. The next prime is 621893. The reversal of 621886 is 688126.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621883) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 841 + ... + 1396.

It is an arithmetic number, because the mean of its divisors is an integer number (117495).

2⁶²¹⁸⁸⁶ is an apocalyptic number.

621886 is a deficient number, since it is larger than the sum of its proper divisors (318074).

621886 is a wasteful number, since it uses less digits than its factorization.

621886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2378.

The product of its digits is 4608, while the sum is 31.

The square root of 621886 is about 788.5974892174. The cubic root of 621886 is about 85.3565644487.

The spelling of 621886 in words is "six hundred twenty-one thousand, eight hundred eighty-six".