621718 has 8 divisors (see below), whose sum is σ = 981720. Its totient is φ = 294480.

The previous prime is 621703. The next prime is 621721. The reversal of 621718 is 817126.

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

It is a junction number, because it is equal to n+sod(n) for n = 621692 and 621701.

It is a congruent number.

It is an unprimeable number.

621718 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 3 ways as a sum of consecutive naturals, for example, 8143 + ... + 8218.

It is an arithmetic number, because the mean of its divisors is an integer number (122715).

2⁶²¹⁷¹⁸ is an apocalyptic number.

621718 is a deficient number, since it is larger than the sum of its proper divisors (360002).

621718 is a wasteful number, since it uses less digits than its factorization.

621718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16382.

The product of its digits is 672, while the sum is 25.

The square root of 621718 is about 788.4909638036. The cubic root of 621718 is about 85.3488775123.

The spelling of 621718 in words is "six hundred twenty-one thousand, seven hundred eighteen".