621986 has 8 divisors (see below), whose sum is σ = 936684. Its totient is φ = 309760.

The previous prime is 621983. The next prime is 621997. The reversal of 621986 is 689126.

It can be written as a sum of positive squares in 2 ways, for example, as 591361 + 30625 = 769^2 + 175^2 .

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

It is not an unprimeable number, because it can be changed into a prime (621983) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 266 + ... + 1146.

2⁶²¹⁹⁸⁶ is an apocalyptic number.

621986 is a deficient number, since it is larger than the sum of its proper divisors (314698).

621986 is a wasteful number, since it uses less digits than its factorization.

621986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236.

The product of its digits is 5184, while the sum is 32.

The square root of 621986 is about 788.6608903705. The cubic root of 621986 is about 85.3611393488.

It can be divided in two parts, 62 and 1986, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 621986 in words is "six hundred twenty-one thousand, nine hundred eighty-six".