621706 has 8 divisors (see below), whose sum is σ = 939780. Its totient is φ = 308448.

The previous prime is 621703. The next prime is 621721. The reversal of 621706 is 607126.

621706 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 585225 + 36481 = 765^2 + 191^2 .

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

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (621701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 861 + ... + 1408.

2⁶²¹⁷⁰⁶ is an apocalyptic number.

621706 is a deficient number, since it is larger than the sum of its proper divisors (318074).

621706 is a wasteful number, since it uses less digits than its factorization.

621706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2408.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 621706 is about 788.4833542948. The cubic root of 621706 is about 85.3483283924.

It can be divided in two parts, 6 and 21706, that added together give a palindrome (21712).

The spelling of 621706 in words is "six hundred twenty-one thousand, seven hundred six".